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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<style>
dt { font-weight: bold; }
h3 { text-decoration: underline; }
dd { margin-top: 10px; margin-bottom: 10px; }
dd p { margin-top: 0; }
dd div { margin: 10px 0; }
</style>
<title>Wt Release notes</title>
</head>
<body>
<h1>Wt Release notes</h1>
This file lists important notes on migrating existing applications to
newer version of Wt. It lists changes in the library that may break
the way you build Wt, the way you configure Wt or the Wt API and
behaviour.
<h2>Release 4.13.1 (April 15, 2026)</h2>
<p>Wt 4.13.1 is a patch release that addresses the following issues:</p>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/14472" target="_blank">Issue #14472</a>:
delayed the automatic connection of the
<a href="classWt_1_1WWebWidget.html#ae33de6853f17057cb6a8ff06a160b14d" target="_blank">WWebWidget::focussed()</a> signal until the first
render of the widget.
</ul>
<h2>Release 4.13.0 (April 14, 2026)</h2>
<p>Wt 4.13.0 is a major release that introduces the following new features:</p>
<ul>
<li>
<a href="https://redmine.webtoolkit.eu/issues/12968" target="_blank">Issue #12968</a>:
It is now possible to send notifications trough JavaScript notification API using <a href="classWt_1_1WNotification.html" target="_blank">WNotification</a>. You
can see examples of how to use it in the
<a href="https://www.webtoolkit.eu/widgets/notification" target="_blank">Widget Gallery</a>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/12967" target="_blank">Issue #12967</a>:
It is now possible to change the favicon of an individual
<a href="classWt_1_1WApplication.html" target="_blank">WApplication</a> using
<a href="classWt_1_1WApplication.html#a2681edc4e1b0edbb22c5e1aa72381101" target="_blank">WApplication::setFavicon()</a>. This takes as parameter a
<a href="classWt_1_1WFavicon.html" target="_blank">WFavicon</a> which is a new class representing favicons. Since the main goal of this feature is to allow developers to notify
the user using the favicon, the WFavicon is mainly designed to make around this idea. While WFavicon is an abstract class, we also added four specialisations of this class.
The
<a href="classWt_1_1WResourceFavicon.html" target="_blank">WResourceFavicon</a> and
<a href="classWt_1_1WUrlFavicon.html" target="_blank">WUrlFavicon</a> are simple specialisations of WFavicon that allows to create a favicon from a
<a href="classWt_1_1WResource.html" target="_blank">WResource</a> or a URL respectively.
The
<a href="classWt_1_1WRasterFavicon.html" target="_blank">WRasterFavicon</a>, uses a
<a href="classWt_1_1WRasterImage.html" target="_blank">WRasterImage</a> to update the favicon (this is only available if WRasterImage is available).
And the
<a href="classWt_1_1WFaviconPair.html" target="_blank">WFaviconPair</a>, can be used to switch between two
<a href="classWt_1_1WFavicon.html" target="_blank">WFavicon</a>.
You can see examples of how to use it in the
<a href="https://www.webtoolkit.eu/widgets/notification/wfavicon" target="_blank">Widget Gallery</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/12946" target="_blank">Issue #12946</a>:
Added
<a href="classWt_1_1WBadge.html" target="_blank">WBadge</a>, a new class that represents a badge which is a text
with a special look. Badges are often used to draw the attention, or warn of updates.
It is possible to add a WBadge to a
<a href="classWt_1_1WPushButton.html" target="_blank">WPushButton</a>, to a
<a href="classWt_1_1WMenuItem.html" target="_blank">WMenuItem</a>, (and by extension) to a
<a href="classWt_1_1WTabWidget.html" target="_blank">WTabWidget</a>.
You can see examples of how to use it in the
<a href="https://www.webtoolkit.eu/widgets/notification/wbadge" target="_blank">Widget Gallery</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13785" target="_blank">Issue #13785</a>:
<a href="classWt_1_1WAbstractItemView.html#ae68d56771c5e9d408d78b4b9d198967f" target="_blank">WAbstractItemView::scrollTo()</a> now also
takes the column of the index into account when scrolling to an item. It is now also possible to specify different hints for the row and
column when scrolling to an item.
Additionally, some bugs linked to scrolling were fixed for both
<a href="classWt_1_1WTableView.html" target="_blank">WTableView</a> and
<a href="classWt_1_1WTreeView.html" target="_blank">WTreeView</a>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7986" target="_blank">Issue #7986</a>:
added caching for form objects data on the server side to reduce the size of the request sent to the server by the client.
This can be disabled by setting the <code>form-data-caching</code> option to <code>false</code> in the <code>wt_config.xml</code> file.
Note that this reduction in request size may come at the cost of an increase response size when updating form objects. It is possible
to limit this impact by changing the <code>form-data-resend-ratio-limit</code> option in the <code>wt_config.xml</code> file.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14305" target="_blank">Issue #14305</a>:
added the possibility to change the format of the access logs using
<a href="classWt_1_1WServer.html#ac513e830dbe4eb582bfc37b27826c7c1" target="_blank">WServer::setAccessLoggerFormat()</a>.
Additionally, the access logger is now accessible through the new
<a href="classWt_1_1WServer.html#acc962bccafdd3345b2d4e39e6b9baf31" target="_blank">WServer::accessLogger()</a> function, which
allows to change the output file of the access logger at runtime. To complement this, it is now also possible to change
whether the access logs are redirected to the standard logger or not using
<a href="classWt_1_1WServer.html#a3aeddcc6ac27fab56874747b3dddee71" target="_blank">WServer::setRedirectAccessLog()</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/12940" target="_blank">Issue #12940</a>:
Added
<a href="classWt_1_1WTextF.html" target="_blank">WTextF</a> which is text that can be exposed to the client side. This allows developers to handle updates to the text of a
<a href="classWt_1_1WPaintedWidget.html" target="_blank">WPaintedWidget</a> directly on the client side.
<a href="classWt_1_1WPaintDevice.html" target="_blank">WPaintDevice</a>, and
<a href="classWt_1_1WPainter.html" target="_blank">WPainter</a> have been updated to use WTextF instead of
<a href="classWt_1_1WString.html" target="_blank">WString</a>.
</li>
</ul>
<p>Wt 4.13.0 also fixes the following bugs:</p>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/14441" target="_blank">Issue #14441</a>:
fixed segmentation fault that could occur when deleting a
<a href="classWt_1_1WApplication.html" target="_blank">WApplication</a> that had a
<a href="classWt_1_1WDialog.html" target="_blank">WDialog</a> open.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14447" target="_blank">Issue #14447</a>:
fixed
<a href="classWt_1_1WRadioButton.html" target="_blank">WRadioButton</a> never being set to the checked state
from the client side when not being inside a
<a href="classWt_1_1WButtonGroup.html" target="_blank">WButtonGroup</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14416" target="_blank">Issue #14416</a>:
fixed
<a href="classWt_1_1WWebWidget.html#aa140064593fa5f47ebdf26fcf71c4948" target="_blank">WWebWidget::setSelectable(true)</a> preventing selection instead of allowing it.
This caused several widgets to have unselectable text, like in
<a href="https://redmine.emweb.be/issues/14310" target="_blank">issue #14310</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14035" target="_blank">Issue #14035</a>:
fixed
<a href="classWt_1_1WBoxLayout.html#a3484fc08d50ec25c3f596cf6c9aea500" target="_blank">WHBoxLayout::itemAt()</a>,
<a href="classWt_1_1WBoxLayout.html#a3484fc08d50ec25c3f596cf6c9aea500" target="_blank">WVBoxLayout::itemAt()</a>, and
<a href="classWt_1_1WGridLayout.html#a77fef7a57e94c094ca88105874db028b" target="_blank">WGridLayout::itemAt()</a> not checking that
the given index was in the valid range, leading to segfault instead of returning nullptr.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14455" target="_blank">Issue #14455</a>:
fixed widgets in layout with
<a href="namespaceWt.html#aeb0e4f49ce4a28d8ce9b0c6005027876" target="_blank">Wt::LayoutImplementation::Flex</a>
not having their preferred size updated after being resized.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14436" target="_blank">Issue #14436</a>:
fixed some cases where widgets in a layout with
<a href="namespaceWt.html#aeb0e4f49ce4a28d8ce9b0c6005027876" target="_blank">Wt::LayoutImplementation::Flex</a>
would be partially hidden instead of shrinking.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13574" target="_blank">Issue #13574</a>:
fixed
<a href="classWt_1_1WTableView.html" target="_blank">WTableView</a> headers label
alignment when aligning to the right or the center.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14053" target="_blank">Issue #14053</a>:
fixed
<a href="classWt_1_1WAbstractProxyModel.html" target="_blank">WAbstractProxyModel</a> not using the overridden version of
<a href="classWt_1_1WAbstractItemModel.html#a4d7fa5951281dd9b623c9afd7ed9c2ef" target="_blank">WAbstractItemModel::dropEvent()</a> when handling drop events.
</li>
<li>
Fixed
<a href="classWt_1_1WRasterImage.html" target="_blank">WRasterImage</a> unable to read dataUri when using
<a href="http://www.graphicsmagick.org/" target="_blank">GraphicsMagick</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14504" target="_blank">Issue #14504</a>:
fixed
<a href="classWt_1_1WItemDelegate.html#ad846a8933d846fc43394bb6d5fd78d7e" target="_blank">WItemDelegate::editState()</a> and
<a href="classWt_1_1WItemDelegate.html#aa1519431acb606b62b9d4f8faf279d03" target="_blank">WItemDelegate::setEditState()</a>
segfaulting when the editor widget was not a
<a href="classWt_1_1WLineEdit.html" target="_blank">WLineEdit</a>. It will now log an error instead of crashing.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14427" target="_blank">Issue #14427</a>:
fixed a SIGFPE that could happen when using
<a href="classWt_1_1WLocalizedStrings.html#a2f50fd381c0757539a635a9992eebdab" target="_blank">WLocalizedStrings::evaluatePluralExpression()</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14431" target="_blank">Issue #14431</a>:
added a workaround for libc++ not supporting <code>std::chrono::clock_cast</code> yet,
as this was causing a compilation error when compiling with libc++ with c++ version 20.
</li>
</ul>
<p>Wt 4.13.0 also comes with the following improvements:</p>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/13841" target="_blank">Issue #13841</a>:
added the ability to retrieve the currently focused widget in a Wt application using
<a href="classWt_1_1WApplication.html#a1918508a02889373a9e1fc1d872f2753" target="_blank">WApplication::focusedWidget()</a>,
or its ID using
<a href="classWt_1_1WApplication.html#a7e094aee22c9ce9ad74ed76a11e1b109" target="_blank">WApplication::focus()</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/9328" target="_blank">Issue #9328</a>:
improved the positioning of tooltips so that they do not go outside of the screen and
add a vertical scrollbar to the tooltip if necessary.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13789" target="_blank">Issue #13789</a>:
added support for more
<a href="group__signalslot.html#ga34e65660d30e69c56aa636a8856aa52d" target="_blank">Key</a>s in
<a href="classWt_1_1WKeyEvent.html" target="_blank">WKeyEvent</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14209" target="_blank">Issue #14209</a>:
removed all uses of <code>asio::strand::wrap()</code> to avoid deprecated warnings
when compiling Wt with boost 1.90.0 or later.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14459" target="_blank">Issue #14459</a>:
added more strictness to incoming GET requests. In <a href="https://redmine.emweb.be/issues/13970" target="_blank">Issue #13970</a>,
we already ensure that a <code>wtd</code> alone in a new request would be considered suspect. Now we add <code>signal</code> (in itself) as a suspect
parameter too. When combined, they are allowed.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14420" target="_blank">Issue #14420</a>:
made
<a href="classWt_1_1Dbo_1_1collection_1_1iterator.html" target="_blank">Dbo::collection::iterator</a> and
<a href="classWt_1_1Dbo_1_1collection_1_1const__iterator.html" target="_blank">Dbo::collection::const_iterator</a>
default constructible so that
<a href="classWt_1_1Dbo_1_1collection.html" target="_blank">Dbo::collection</a>
can be used inside <code>std::ranges::end()</code>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14467" target="_blank">Issue #14467</a>:
replaced the use of the deprecated <code>unload</code> event with <code>pagehide</code>
to know when a page is being unloaded by the browser.
</li>
</ul>
<h2>Release 4.12.6 (March 17, 2026)</h2>
<p>Wt 4.12.6 is a patch release that addresses the following issues:</p>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/14376" target="_blank">Issue #14376</a>:
fixed
<a href="classWt_1_1WTableView.html#a4e5900e1c92219763c7b5d4a9e1ac2c5" target="_blank">WTableView::itemWidget()</a>
wrongly returning unrendered widgets when used in plain HTML mode. This could then also lead to a segmentation fault when
trying to modify the headers before the view was rendered.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14066" target="_blank">Issue #14066</a>:
fixed
<a href="classWt_1_1WTableView.html" target="_blank">WTableView</a> header columns not
always having the same height as the content columns, which lead to several issues.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14319" target="_blank">Issue #14319</a>:
fixed <a href="classWt_1_1WTableView.html" target="_blank">WTableView</a> sometimes not updating after
a client-side resize.
Additionally, fixed
<a href="classWt_1_1WTableView.html#a093b661f93551c1d6f73c423ae8ef459" target="_blank">WTableView::scrollTo()</a> with
<a href="namespaceWt.html#ae0fdcefe4b1fefe747b5f423c020334aa47ec5fd00436263c0d6b91bf575ea690" target="_blank">ScrollHint::EnsureVisible</a>
inverting top and bottom.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14332" target="_blank">Issue #14332</a>:
fixed
<a href="classWt_1_1WDialog.html" target="_blank">WDialog</a>'s content being cut off when containing a
<a href="classWt_1_1WTableView.html" target="_blank">WTableView</a> with a width bigger than the dialog itself.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14293" target="_blank">Issue #14293</a>:
fixed
<a href="classWt_1_1WDialog.html" target="_blank">WDialog</a> fitting to its content in
<a href="classWt_1_1WBootstrap2Theme.html" target="_blank">WBootstrap2Theme</a> and
<a href="classWt_1_1WBootstrap3Theme.html" target="_blank">WBootstrap3Theme</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13958" target="_blank">Issue #13958</a>:
corrected a JavaScript error when using <a href="namespaceWt.html#aeb0e4f49ce4a28d8ce9b0c6005027876" target="_blank">Wt::LayoutImplementation::Flex</a>
with a disabled ancestor widget.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13692" target="_blank">Issue #13692</a>:
fixed JS layouts in <a href="classWt_1_1WStackedWidget.html" target="_blank">WStackedWidget</a>
not being updated after being switched in with an animation. This would lead to the
content of the layout being fitted to the size of the old container.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14352" target="_blank">Issue #14352</a>:
fixed compilation error that could happen when using clang with C++20 with the
<code>WT_CPP17_FILESYSTEM_IMPLEMENTATION="std"</code> option.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14395" target="_blank">Issue #14395</a>:
added the scope to some <code>target_compile_definitions</code> where they were missing.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14268" target="_blank">Issue #14268</a>:
fixed a use-after-free in the <code>wthttp connector</code> that could happen when closing the server.
</li>
</ul>
<p>Wt 4.12.6 also comes with the following improvements:</p>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/14356" target="_blank">Issue #14356</a>:
ensured that
<a href="classWt_1_1WDialog.html" target="_blank">WDialog</a> top-left corner is visible when the dialog
position is automatically determined by wt.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14380" target="_blank">Issue #14380</a>:
changed the style class <code>.in</code> for <code>.show</code> when using
<a href="classWt_1_1WBootstrap5Theme.html" target="_blank">WBootstrap5Theme</a> as it is the
correct class to use for Bootstrap 5.
</li>
</ul>
<h2>Release 4.12.5 (March 3, 2026)</h2>
<p>Wt 4.12.5 is a patch release that addresses the following issues:</p>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/14371" target="_blank">Issue #14371</a>:
fixed
<a href="classWt_1_1Auth_1_1AuthWidget.html" target="_blank">Auth::AuthWidget</a> sometimes reloading the page
just after being created.
</li>
</ul>
<h2>Release 4.12.4 (March 2, 2026)</h2>
<p>Wt 4.12.4 is a patch release that addresses the following issues:</p>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/14355" target="_blank">Issue #14355</a>:
fixed
<a href="classWt_1_1WRadioButton.html" target="_blank">WRadioButton</a> inside a
<a href="classWt_1_1WButtonGroup.html" target="_blank">WButtonGroup</a> not being
updated on the server side when changed on the client side.
</li>
<li>
<a href="https://redmine.emweb.be/issues/11505" target="_blank">Issue #11505</a>:
<a href="classWt_1_1WAbstractItemModel.html#a3c4a0ffe050bc0d11feeac4749dde784" target="_blank">WStandardItemModel::setHeaderData()</a> will now
correctly return false instead of making Wt crash when given a wrong section. An error will be logged to let
the developer know a wrong section was given.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13417" target="_blank">Issue #13417</a>:
fixed a heap buffer overflow when using <code>Auth::AuthUtils::createSalt()</code> with a size that is
not a multiple of 3.
</li>
</ul>
<p>Wt 4.12.4 also comes with the following improvements:</p>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/13498" target="_blank">Issue #13498</a>:
<a href="classWt_1_1Auth_1_1AuthModel.html" target="_blank">Auth::AuthModel</a> will now change session id on logout as recommended by
<a href="https://owasp.org/" target="_blank">OWASP</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13537" target="_blank">Issue #13537</a>:
<a href="classWt_1_1Dbo_1_1Query.html" target="_blank">Dbo::Query</a> with
<a href="structWt_1_1Dbo_1_1DirectBinding.html" target="_blank">DirectBinding</a> as <code>BindStrategy</code> are now deprecated and
will be completely removed later. <a href="structWt_1_1Dbo_1_1DynamicBinding.html" target="_blank">DynamicBinding</a> <code>BindStrategy</code>
should be used instead.
</li>
</ul>
<h2>Release 4.12.3 (February 20, 2026)</h2>
<p> Wt 4.12.3 is a patch release that addresses the following issues: </p>
<dl class="section note">
<dt>CVE (ID pending)</dt>
<dd>
Addressed a Use-After-Free vulnerability in the <code>wthttp connector</code>. See
<a href="https://redmine.emweb.be/issues/14136" target="_blank">Issue #14136</a> for more details.
<br/>
We recommend anyone to upgrade live deployments of his application to the latest version.
</dd>
</dl>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/14311" target="_blank">Issue #14311</a>:
fixed missing boost dependency when building Wt with the flag <code>-DWT_CPP17_FILESYSTEM_IMPLEMENTATION="std"</code>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14065" target="_blank">Issue #14065</a>:
fixed segfault happening when calling
<a href="classWt_1_1WTableView.html#a4e5900e1c92219763c7b5d4a9e1ac2c5" target="_blank">WTableView::itemWidget()</a>
in a session without ajax support.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14311" target="_blank">Issue #14311</a>:
fixed
<a href="classWt_1_1WDialog.html" target="_blank">WDialog</a> not taking the removal of the widgets in
its title bar into account, leading to segfaults when trying to access those widgets after they were removed.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14302" target="_blank">Issue #14302</a>:
fixed fatal error happening when changing the
<a href="namespaceWt.html#aeb0e4f49ce4a28d8ce9b0c6005027876" target="_blank">LayoutImplementation</a> of a sublayout in a flex layout.
</li>
<li>
<a href="https://redmine.emweb.be/issues/12393" target="_blank">Issue #12393</a>:
<a href="classWt_1_1WLeafletMap.html" target="_blank">WLeafletMap</a>
no longer causes a JavaScript error when reloading the session after panning.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14300" target="_blank">Issue #14300</a>:
reverted empty columns in
<a href="classWt_1_1WStandardItemModel.html" target="_blank">WStandardItemModel</a> being automatically removed.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14285" target="_blank">Issue #14285</a>:
fixed
<a href="classWt_1_1WStandardItem.html#a080134e93f657537f4911c49b0523332" target="_blank">WStandardItem::row()</a> and
<a href="classWt_1_1WStandardItem.html#ae8b4f98da65e93e8e94a1586e1124e55" target="_blank">WStandardItem::column()</a> being incorrect
for most of the newly added items when adding multiple rows or columns at once to a
<a href="classWt_1_1WStandardItemModel.html" target="_blank">WStandardItemModel</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/11875" target="_blank">Issue #11875</a>:
fixed <a href="classWt_1_1WTreeView.html" target="_blank">WTreeView</a>
taking all the available width when inside of a layout with
<a href="namespaceWt.html#aeb0e4f49ce4a28d8ce9b0c6005027876" target="_blank">Wt::LayoutImplementation::Flex</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14094" target="_blank">Issue #14094</a>:
fixed vertical scrollbar being missplaced in
<a href="classWt_1_1WTableView.html" target="_blank">WTableView</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14346" target="_blank">Issue #14346</a>:
ensured a <a href="classWt_1_1WSuggestionPopup.html" target="_blank">WSuggestionPopup</a>
no longer scrolls the page on selection.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14291" target="_blank">Issue #14291</a>:
fixed
<a href="classWt_1_1WCheckBox.html" target="_blank">WCheckBox</a> and
<a href="classWt_1_1WRadioButton.html" target="_blank">WRadioButton</a> state sometimes being
momentarily considered set to <code>Unchecked</code> on the server side when added to the page.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13855" target="_blank">Issue #13855</a>:
avoided a useless HTTP request being sent when the
<a href="classWt_1_1WTextEdit.html#a5952f46d2f8d21e2fd45135e29d5061d" target="_blank">WTextEdit</a>
is rendered, if the signal is not connected. The resulting error log, coming from the
<a href="classWt_1_1WApplication.html" target="_blank">WApplication</a>
trying to interpret the signal, is now avoided.
</li>
</ul>
<p> Wt 4.12.3 also comes with the following improvements: </p>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/14226" target="_blank">Issue #14226</a>:
clicking a collapse/expand button inside a
<a href="classWt_1_1WTreeView.html" target="_blank">WTreeView</a> will not select the row anymore.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14347" target="_blank">Issue #14347</a>:
increased the clickable area of the dropdown button in <a href="classWt_1_1WSuggestionPopup.html" target="_blank">WSuggestionPopup</a>
for Bootstrap 2 and 3 themes, to better match the actual size of the button.
</li>
</ul>
<h2>Release 4.12.2 (January 28, 2026)</h2>
<p>
Wt 4.12.2 is a patch release that addresses the following issues:
</p>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/13880" target="_blank">Issue #13880</a>:
fixed bot potentially being redirected to another page when trying to load a private
resource.
Additionally, it is now possible to configure whether private resources are served
to bots by setting the <code>serve-private-resources-to-bots</code> option to true.
In that case, the private resources that have overridden the
<a href="classWt_1_1WResource.html#ae2d1f6fe25f575297ed3bd315f72a667" target="_blank">WResource::botResource()</a>
method will be added as public resources so that it can be served to bots. That
function is already overridden by
<a href="classWt_1_1WRasterImage.html" target="_blank">WRasterImage</a> and
<a href="classWt_1_1WSvgImage.html" target="_blank">WSvgImage</a>.
The path under which these bot resources are exposed can be configured using the
<code>bot-resources-path</code> option in the <code>wt_config.xml</code> file and the
<a href="classWt_1_1WResource.html#af7b9c1cec14007140a55bfc6fbb69cea" target="_blank">WResource::setBotResourceId()</a>
method.
Finally, in order to help managing those bot resources, it is now possible to remove
entrypoints while the server is running, and the new
<a href="classWt_1_1WSelfDeletingResource.html" target="_blank">WSelfDeletingResource</a>
class was added, which is a WResource that will automatically unexposed itself after
being served once.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13798" target="_blank">Issue #13798</a>:
fixed
<a href="classWt_1_1WPopupMenu.html" target="_blank">WPopupMenu</a> submenus not taking
<a href="classWt_1_1WPopupMenu.html#a47a35b9b9ff72ea1c9daf86897730bd3" target="_blank">WPopupMenu::setAdjust()</a>
flags into account when opening. Since
<a href="classWt_1_1WPopupMenu.html" target="_blank">WPopupMenu</a> submenus can now
hide its parent menu, more control over
<a href="classWt_1_1WPopupMenu.html#a5f65e7578883ecad37e9b1aae6a6cfe5" target="_blank">WPopupMenu::setAutoHide()</a>
was added, by allowing to change it for submenus as well, and by adding different
<a href="classWt_1_1WPopupMenu.html#ae7784177e77b54a16ccdb5dc720659fe" target="_blank">WPopupMenu::AutoHideBehaviour</a>
options that can be set using
<a href="classWt_1_1WPopupMenu.html#a5d52d004e6012067c722ccb9d29c129b" target="_blank">WPopupMenu::setAutoHideBehaviour()</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14058" target="_blank">Issue #14058</a>:
ensured the initial <a href="classWt_1_1WMenu.html" target="_blank">WMenu</a> or
<a href="classWt_1_1WTabWidget.html" target="_blank">WTabWidget</a> selection is visually rendered.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13861" target="_blank">Issue #13861</a>:
corrected the layout rendering for <a href="classWt_1_1WMenuItem.html" target="_blank">WMenuItem</a>,
that are loaded <a href="namespaceWt.html#af25a7f0bb1d50c5b8bc98c4db9080313" target="_blank">Lazy</a>
through a <a href="classWt_1_1WStackedWidget.html" target="_blank">WStackedWidget</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13961" target="_blank">Issue #13961</a>:
corrected a check in the JavaScript code that was creating an error when pasting content to a
<a href="classWt_1_1WTextEdit.html" target="_blank">WTextEdit</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13786" target="_blank">Issue #13786</a>:
fixed <a href="classWt_1_1WTableView.html#a093b661f93551c1d6f73c423ae8ef459" target="_blank">WTableView::scrollTo()</a>
only checking if the top of the row was in the viewport in order to decide whether to scroll or not. It will now scroll if
either the top or the bottom of the row are not in the viewport.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13775" target="_blank">Issue #13775</a>:
fixed <a href="classWt_1_1WTreeView.html" target="_blank">WTreeView</a> cells
clearing their style classes if the size of their HTML <code>class</code>
exceeded 1024 characters.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13818" target="_blank">Issue #13818</a>:
fixed <a href="classWt_1_1WGroupBox.html" target="_blank">WGroupBox</a> switching from horizontal to vertical layouting inside a
<a href="namespaceWt.html#aeb0e4f49ce4a28d8ce9b0c6005027876" target="_blank">LayoutImplementation::Flex</a> when using
<a href="classWt_1_1WGroupBox.html#a369081aa62b840875cac9ee5d24bd64e" target="_blank">WGroupBox::setTitle()</a>.
Additionally, fixed
<a href="classWt_1_1WGroupBox.html" target="_blank">WGroupBox</a> not always respecting the minimum
size of its content when having a
<a href="namespaceWt.html#aeb0e4f49ce4a28d8ce9b0c6005027876" target="_blank">LayoutImplementation::JavaScript</a>.
This could lead to other widget overlapping the content of the
<a href="classWt_1_1WGroupBox.html" target="_blank">WGroupBox</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13670" target="_blank">Issue #13670</a>:
fixed the following issues with layouts:
<ul>
<li>
a bug where JavaScript layouts would sometimes not allow its
<a href="classWt_1_1WContainerWidget.html" target="_blank">WContainerWidget</a> to be resized.
</li>
<li>
a bug leading to items in flex layouts to have negative margins.
</li>
<li>
JavaScript layouts not taking margins into account if those margins width were set using
"thin", "medium" or "thick".
</li>
<li>
JavaScript layouts sometimes leaving a pixel between its content and the border of its
<a href="classWt_1_1WContainerWidget.html" target="_blank">WContainerWidget</a>. This was
especially visible when zooming in or out on the page.
</li>
<li>
elements inside of
<a href="classWt_1_1WHBoxLayout.html" target="_blank">WHBoxLayout</a> or
<a href="classWt_1_1WVBoxLayout.html" target="_blank">WVBoxLayout</a> respectively not filling
the entire column/row, if its height/width was not set to "auto".
</li>
<li>
flex layouts not making their
<a href="classWt_1_1WContainerWidget.html" target="_blank">WContainerWidget</a> fit its content
when the <code>WContainerWidget</code> had a <code>max-width</code> or a <code>max-height</code>
set, without having a <code>width</code> or a <code>height</code> set.
</li>
<li>
flex layouts not allowing their content aligned in the same direction as itself to be shrunk.
This could lead to several elements overlapping each other.
</li>
</ul>
</li>
<li>
<a href="https://redmine.emweb.be/issues/13674" target="_blank">Issue #13674</a>:
fixed URL fragments sometimes being considered part of the internal path.
</li>
<li>
<a href="https://redmine.emweb.be/issues/9864" target="_blank">Issue #9864</a>:
fixed a bug that would prevent functions with more than 3 arguments to be connected to a
<a href="classWt_1_1Signal.html" target="_blank">WSignal</a>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/13733" target="_blank">Issue #13733</a>:
ensured that when using any chart with an underlying <a href="classWt_1_1Dbo_1_1QueryModel.html" target="_blank">QueryModel</a>,
an out-of-bounds index will no longer be checked by default. This will no longer cause a crash.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13777" target="_blank">Issue #13777</a>:
It's now made sure that a change on <a href="classWt_1_1WStandardItemModel.html" target="_blank">WStandardItemModel</a>
cannot be performed on invalid indices, with a crash as a result.
Nor can this change be (incorrectly) propagated to a <a href="classWt_1_1WTreeView.html" target="_blank">WTreeView</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14079" target="_blank">Issue #14079</a>:
corrected various functions of both <a href="classWt_1_1WAbstractItemModel.html" target="_blank">WAbstractItemModel</a> and
<a href="classWt_1_1WAbstractListModel.html" target="_blank">WAbstractListModel</a>.
Many of its implementations also received fixes.
</li>
<li>
<a href="https://redmine.emweb.be/issues/10954" target="_blank">Issue #10954</a>:
fixed
<a href="classWt_1_1WTime.html#" target="_blank">WTime</a> and
<a href="classWt_1_1WDateTime.html#" target="_blank">WDateTime</a> ignoring every 'h' and 'H' character
preceded by a single quote inside of the format.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13388" target="_blank">Issue #13388</a>:
prevented a segmentation fault from happening when authenticating a user with
<a href="classWt_1_1Auth_1_1Mfa_1_1TotpProcess.html" target="_blank">Auth::Mfa::TotpProcess</a>
while using a database not supporting transactions.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13740" target="_blank">Issue #13740</a>:
fixed a race condition in
<a href="classWt_1_1Auth_1_1OAuthProcess.html" target="_blank">Auth::OAuthProcess</a> that could in some
rare cases lead to a crash.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13714" target="_blank">Issue #13714</a>:
fixed a race condition in
<a href="classWt_1_1Http_1_1Client.html" target="_blank">Http::Client</a> that could lead to a crash if the
<a href="classWt_1_1Http_1_1Client.html#aad874b0869cb2202f6cd2b79e3956773" target="_blank">Http::Client::headersReceived()</a> signal was emitted while
the <code>Http::Client</code> was updating the body of the
<a href="classWt_1_1Http_1_1Message.html" target="_blank">Http::Message</a>.
</li>
</ul>
<p>
Wt 4.12.2 also comes with the following improvements:
</p>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/13770" target="_blank">Issue #13770</a>:
separated the default strings and templates in two different <code>xml</code> files. This should make it easier to localize the default strings.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13791" target="_blank">Issue #13791</a>:
made the focus go back to the last focused widget when a popup gets hidden.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/13776" target="_blank">Issue #13776</a>:
the validity time of the link sent to:
<ul>
<li>validate a user's email address</li>
<li>reset a user's password</li>
</ul>
is now mentioned in both the email itself and the confirmation popup shown to the user.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14267" target="_blank">Issue #14267</a>:
added client URL in JavaScript error reports.
</li>
<li>
<a href="https://redmine.emweb.be/issues/14192" target="_blank">Issue #14192</a>:
made <a href="namespaceWt_1_1Auth_1_1Mfa.html#abe89fce88c4deaabe28085fd1c57742f" target="_blank">Auth::Mfa::validateCode()</a>
accept the next code as well as the current and previous codes.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13052" target="_blank">Issue #13052</a>:
delayed the generation of the internal path from text in
<a href="classWt_1_1WMenuItem.html" target="_blank">WMenuItem</a> until
<a href="classWt_1_1WMenuItem.html#a7ed10e994274a4033e546bb346a13488" target="_blank">WMenuItem::pathComponent()</a> is called.
This will stop potential warnings about loss of detail when setting the text of a WMenuItem if the internal path is not used.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13676" target="_blank">Issue #13676</a>:
resolved some Clang and GCC compiler warnings.
Additionally, fixed
<a href="classWt_1_1WFileDropWidget.html" target="_blank">WFileDropWidget</a> making the client update
whether it can accept files or not every time it was updated.
</li>
</ul>
<h2>Release 4.12.1 (October 16, 2025)</h2>
<p>Wt 4.12.1 is a patch release that addresses the following issues:</p>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/13867" target="_blank">Issue #13867</a>:
corrected a breaking default <code>script</code> value of the <code><debug-level></code> configuration. This has been corrected to <code>framework</code>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13878" target="_blank">Issue #13878</a>:
made the access of bot user-agents more restricted. In case the incoming requests carry session-related information, the request is not processed, and a preemptive <code>403</code> status is returned.
Bot agents have their <a href="classWt_1_1WApplication.html" target="_blank">WApplication</a>
killed immediately after the response is served. Therefore a session does not carry meaning over multiple requests.
This resulted in bots being served the page on the path they requested, as a whole again.
While it was previously fixed that bots did not receive session-related parameters, older indexes may still contain them, which should be discouraged.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13768" target="_blank">Issue #13768</a>:
<a href="classWt_1_1Auth_1_1UpdatePasswordWidget.html">UpdatePasswordWidget</a>
no longer automatically logs a user in after a successful password reset.
This would otherwise allow logging in using only a single factor (email),
even when MFA is enabled.
This follows the
<a href="https://cheatsheetseries.owasp.org/cheatsheets/Forgot_Password_Cheat_Sheet.html#user-resets-password" target="_blank">OWASP guidelines</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13669" target="_blank">Issue #13669</a>:
<a href="classWt_1_1WObject.html#a64ce31cadb378c4eba81224f43bf493d" target="_blank">setObjectName()</a> should now correctly set the
<code>data-object-name</code> attribute of the DOM element representing
<a href="classWt_1_1WLayout.html" target="_blank">WLayout</a>,
<a href="classWt_1_1WAbstractArea.html" target="_blank">WAbstractArea</a>,
<a href="classWt_1_1WTableRow.html" target="_blank">WTableRow</a>, and
<a href="classWt_1_1WTableColumn.html" target="_blank">WTableColumn</a>.
Additionally, flexbox-based sub-layouts should now correctly be updated when removing or adding a widget to it, or when update is called.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13720" target="_blank">Issue #13720</a>:
fixed
<a href="classWt_1_1WAnchor.html" target="_blank">WAnchor</a> and
<a href="classWt_1_1WAbstractArea.html" target="_blank">WAbstractArea</a> with no link losing their style classes.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/13676" target="_blank">Issue #13676</a>:
fixed a potential race condition at the destruction of an
<a href="classWt_1_1Http_1_1Client.html">Http::Client</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13508" target="_blank">Issue #13508</a>:
fixed validation style being applied to a
<a href="classWt_1_1WFormWidget.html" target="_blank">WFormWidget</a> on its first
rendering. Now, the validation is only applied once the user selects the widget, or when validation is called, using
<a href="classWt_1_1WFormWidget.html#a1bf85706ce6af9324706457bf2f9ca83" target="_blank">WFormWidget::validate()</a>.
Additionally, this introduces <a href="classWt_1_1WTheme.html#a93fb4b6d3e0e31498eded37fe4d77f8f" target="_blank">WTheme::loadValidationStyling()</a>.
This needs to be called for client-side validation to be available if extra JavaScript is necessary for it.
It is an optimization, that ensures not all JavaScript is immediately loaded for the theme.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13536" target="_blank">Issue #13536</a>:
fixed
<a href="classWt_1_1Dbo_1_1QueryModel.html" target="_blank">QueryModel</a> sometimes not completely filling it's row cache when loading rows at the end
of the table.
Additionally, fixed <a href="classWt_1_1WTableView.html" target="_blank">WTableView</a> scrolling sometimes not being synchronised with the server, leading to the wrong data being sent to the
client. This was more likely to occur when the connection with the server was slow.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13996" target="_blank">Issue #13996</a>:
added some tests for the encoding of HTML text, and made it more explicit that <a href="classWt_1_1WTemplate.html#a2d72efa9d932d6703e3ec012c960c259" target="_blank">WTemplate::bindString()</a> can lead to errors with it.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13464" target="_blank">Issue #13464</a>:
fixed an error happening when re-adding a
<a href="classWt_1_1WMenuItem.html" target="_blank">WMenuItem</a> to a
<a href="classWt_1_1WMenu.html" target="_blank">WMenu</a> if the load policy of the
<a href="classWt_1_1WMenuItem.html" target="_blank">WMenuItem</a> was set to
<a href="namespaceWt.html#af25a7f0bb1d50c5b8bc98c4db9080313" target="_blank">LoadPolicy::Lazy</a>.
Additionally,
<a href="classWt_1_1WMenu.html#afad580a15fd6ed88630c03068cce696b" target="_blank">WMenu::moveItem(int fromIndex, int toIndex)</a>
and
<a href="classWt_1_1WMenu.html#ad376486fb13bfe50629b389b1614bb4d" target="_blank">WMenu::moveItem(WMenuItem* item, int toIndex)</a>
were added to make it easier to move items in
<a href="classWt_1_1WMenu.html" target="_blank">WMenu</a>s.
</li>
<li>
<a href="https://redmine.emweb.be/issues/12424" target="_blank">Issue #12424</a>:
fixed a crash that could happen when a
<a href="classWt_1_1WAbstractMedia.html" target="_blank">WAbstractMedia</a> widget was
added on the same page as a large
<a href="classWt_1_1WTableView.html" target="_blank">WTableView</a>.
Additionally, the rendering of the event handlers is now the same regardless
of whether or not nonces (see <a href="https://redmine.emweb.be/issues/13600" target="_blank">Issue #13600</a>) are enabled.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13530" target="_blank">Issue #13530</a>:
fixed <a href="classWt_1_1WDialog.html" target="_blank">WDialog</a> being always too small by <code>2px</code> when using both
<a href="classWt_1_1WBootstrap5Theme.html" target="_blank">WBootstrap5Theme</a> and
<a href="namespaceWt.html#aeb0e4f49ce4a28d8ce9b0c6005027876" target="_blank">Wt::LayoutImplementation::JavaScript</a>. This lead to scrollbars
being unnecessarily present.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13623" target="_blank">Issue #13623</a>:
fixed JavaScript executed via
<a href="classWt_1_1WApplication.html#a2a92457b9212cef4057cb54e56183967" target="_blank">WApplication::doJavaScript()</a>
with <code>afterLoaded = false</code> being sometimes executed twice on application startup if the call happened before a call to
<a href="classWt_1_1WApplication.html#ae88546224ed32cade783da188b145138" target="_blank">WApplication::require()</a>.
Additionally, fixed libraries being loaded before the JavaScript executed via
<a href="classWt_1_1WApplication.html#a2a92457b9212cef4057cb54e56183967" target="_blank">WApplication::doJavaScript()</a>
with <code>afterLoaded = false</code> when using progressive bootstrap.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13361" target="_blank">Issue #13361</a>:
correct standalone Asio versioning checks, and Boost included Asio versioning checks.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13569" target="_blank">Issue #13569</a>:
most of the automatic application of the theme style are now delayed until the rendering of the widget.
This allows
<a href="classWt_1_1WWidget.html#ae1e28bff803905ca8625c1fb722f3d21" target="_blank">WWidget::setThemeStyleEnabled(false)</a>
to correctly disable the theme style for the widgets. Furthermore, if the theme changes
the DOM structure of the widget,
<a href="classWt_1_1WWidget.html#ae1e28bff803905ca8625c1fb722f3d21" target="_blank">WWidget::setThemeStyleEnabled(false)</a>
will now also stop that change from happening. The description of the function has
also been updated to describe more precisely what it does and what it does not do.
Additionally some cases of style classes being present several times in the same
widget are now fixed.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13683" target="_blank">Issue #13683</a>:
<a href="classWt_1_1WSlider.html" target="_blank">WSlider</a> now also
displays a color from the edge of the widget to the current slider handle position
in Bootstrap 5 theme, as it does in Bootstrap 3 and 2 themes.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13067" target="_blank">Issue #13067</a>:
fixed <a href="classWt_1_1WWebSocketRessource.html" target="_blank">WWebSocketRessource</a> never removing the closed
<a href="classWt_1_1WWebSocketConnection.html" target="_blank">WWebSocketConnection</a> from its memory.
Additionally, the <a href="classWt_1_1WWebSocketConnection.html" target="_blank">WWebSocketConnection</a> will now correctly
close when the request to close the connection is made by the client.
</li>
<li>
<a href="https://redmine.emweb.be/issues/11129" target="_blank">Issue #11129</a>:
fixed the <code>lang</code> HTML tag always being set to <code>en</code> for plain HTML sessions.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13602" target="_blank">Issue #13602</a>:
ensured that the items inside a
<a href="classWt_1_1WSuggestionPopup.html" target="_blank">WSuggestionPopup</a>
receive the correct styling when using
<a href="classWt_1_1WBootstrap5Theme.html" target="_blank">WBootstrap5Theme</a>.
</li>
</ul>
<p>Wt 4.12.1 also comes with the following improvements:</p>
<ul>
<li>
<a href="https://redmine.webtoolkit.eu/issues/13509" target="_blank">Issue #13509</a>:
added the possibility to change the validator of a field in a
<a href="classWt_1_1Form_1_1Dbo_1_1FormView.html" target="_blank">Form::Dbo::FormView</a>
using <a href="classWt_1_1Form_1_1Dbo_1_1FormView.html#a7e21aa07469c8b8d02c3b6d824819979" target="_blank">Form::Dbo::FormView::setValidator()</a>.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13970" target="_blank">Issue #13970</a>:
killed sessions started from suspicious GET requests quicker. The GET request is considered suspect if they contain a <code>wtd</code> (session ID) in the URL for a new session.
This should prevent application from keeping a session that will not identify a regular client (but likely comes from a bot) alive for too long.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13391" target="_blank">Issue #13391</a>:
added the possibility to specify the square size and the error correction level of the
<a href="classWt_1_1Auth_1_1Mfa_1_1TotpQrCode.html" target="_blank">TotpQrCode</a> in the
<a href="classWt_1_1Auth_1_1AuthService.html" target="_blank">AuthService</a> using
<a href="classWt_1_1Auth_1_1AuthService.html#ab283a8ffd6373f79d01d379c3801d1f7" target="_blank">AuthService::setMfaQrCodeSquareSize()</a> and
<a href="classWt_1_1Auth_1_1AuthService.html#ac5d552f65f0bc9398bbc852821e7ee92" target="_blank">AuthService::setMfaQrCodeErrCorrLvl()</a> respectively.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13788" target="_blank">Issue #13788</a>:
the version of Bootstrap 5 bundled with Wt was updated to 5.3.8.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13601" target="_blank">Issue #13601</a>:
updated the <a href="https://fontawesome.com/" target="_blank">Font Awsome library</a>
bundled with Wt to version 4.7.0.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13367" target="_blank">Issue #13367</a>:
<p>
when <a href="classWt_1_1WPainter.html#ae36e5ce0c6a324ec83ebbc397a513202" target="_blank">WPainter::drawImage()</a> was called, the information needed to identify
the image was given via a string. Depending on what <a href="classWt_1_1WPaintDevice.html" target="_blank">WPaintDevice</a> is used to draw the image, the content of this string could differ.
Some devices expected a URI, others a file path to the image or a data URI. This is problematic when using a <a href="classWt_1_1WPaintedWidget.html" target="_blank">WPaintedWidget</a>
since you do not know in advance what <code>WPaintDevice</code> will be used. While this was kind of handled by assuming the file was in the docroot, this did not
give much control to the developer on how it should be handled, and could result in errors due to bad assumptions.
</p>
<p>
To solve this issue we introduce the <a href="classWt_1_1WAbstractDataInfo.html" target="_blank">WAbstractDataInfo</a> class. This class is used by painters
and paint devices to get the location information of the image required to draw it. While <code>WAbstractDataInfo</code> is an abstract class, two subclasses are available
in Wt:
<ul>
<li>
<a href="classWt_1_1WDataInfo.html" target="_blank">WDataInfo</a>, which is constructed by taking both the uri and the path to the file.
</li>
<li>
<a href="classWt_1_1WDocRootDataInfo.html" target="_blank">WDocRootDataInfo</a>, which stores the information about a file in the document root, and is
constructed using the file path relative to the docroot.
</li>
</ul>
</p>
<p>
The methods:
<ul>
<li><a href="classWt_1_1WPainter_1_1Image.html#a54578ddf7c3c625ce0e32173a9f0e781" target="_blank">WPainter::Image::Image(string, int, int)</a></li>
<li><a href="classWt_1_1WPainter_1_1Image.html#a7a82ffdf4f9222bf44175ee0e7f62582" target="_blank">WPainter::Image::Image(string, string)</a></li>
<li><a href="classWt_1_1WPaintDevice.html#a4746873743ea66e4e5bd9adb51782095" target="_blank">WPaintDevice::drawImage(WRectF, string, int, int, WRectF)</a></li>
</ul>
are now deprecated in favor of versions that use <code>WAbstractDataInfo</code> in place of <code>std::string</code>.
</p>
</li>
<li>
<a href="https://redmine.emweb.be/issues/13435" target="_blank">Issue #13435</a>:
allows to configure the minimum number of sessions required to enforce the ratio of plain HTML session
versus Ajax sessions, that is used to prevent DoS. This can be configure via the
<code>min-session-for-dos</code> tag in the <code>wt_config.xml</code> file. The default minimum was
also raised from 20 to 100.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13478" target="_blank">Issue #13478</a>:
the login views in
<a href="namespaceWt_1_1Auth.html" target="_blank">Wt::Auth</a> are now more consistent.
Additionally, the <code>resend-email-verification</code> view is not missing anymore for default, or polished CSS themes.
</li>
<li>
<a href="https://redmine.emweb.be/issues/13881" target="_blank">Issue #13881</a>:
added
<a href="classWt_1_1WResource.html#ae88f496ddf481a6a68301ca6059bdc15" target="_blank">WResource::setAlternativeBotUrl()</a> and
<a href="classWt_1_1WImage.html#ae774907487e84463f48acbbafb4235f8" target="_blank">WImage::setAlternativeBotUrl()</a> that allow
to set an alternative URL that will be served to clients that are detected as bot agents (see <a href="classWt_1_1WEnvironment.html#ad7dd42fefc4e318b6724c71b3a79b487" target="_blank">WEnvironment::agentIsSpiderBot()</a>).
</li>
</ul>
<h2>Release 4.12.0 (July 23, 2025)</h2>
<p>Wt 4.12.0 is a major release that introduces the following new features:</p>
<ul>
<li>
<a href="https://redmine.emweb.be/issues/7450" target="_blank">Issue #7450</a>:
added the option to use <code>std::filesystem</code> instead of <code>boost::filesystem</code> by setting the cache variable <code>WT_CPP17_FILESYSTEM_IMPLEMENTATION</code> to <code>std</code> instead of <code>boost</code>.
<br><strong>IMPORTANT:</strong> Accessing the last time a file was updated with <code>std::filesystem</code> before <code>C++20</code> may result in an imprecise time point. This can affect the <code>wthttp</code>'s <code>last-modified</code> timestamp.
</li>
<li>
<a href="https://redmine.emweb.be/issues/12881" target="_blank">Issue #12881</a>:
added
<a href="classWt_1_1WPasswordEdit.html" target="_blank">WPasswordEdit</a> which ought to replace
<a href="classWt_1_1WLineEdit.html#a27c9bc232bea0ab76ee266be3325a10e" target="_blank">WLineEdit::setEchoMode(EchoMode::Password)</a>
that is now deprecated. You can find examples on how to use this new class in the
<a href="https://www.webtoolkit.eu/widgets/forms/password" target="_blank">Widget Gallery</a>.
It is also now possible to set the input mode of any
<a href="classWt_1_1WLineEdit.html" target="_blank">WLineEdit</a> using
<a href="classWt_1_1WLineEdit.html#a5d772a843fb12447da0e295e6fae805b" target="_blank">WLineEdit::setInputMode()</a>.
This is especially important for mobile devices, where the input mode impacts the
keyboard that is shown to the user when the input field is focused.
<br><strong>IMPORTANT:</strong> it is now possible to combine multiple
<a href="classWt_1_1WValidator.html" target="_blank">WValidator</a>s into a single one,
using the new
<a href="classWt_1_1WStackedValidator.html" target="_blank">WStackedValidator</a>.
</li>
<li>
<a href="https://redmine.webtoolkit.eu/issues/7228" target="_blank">Issue #7228</a>:
Wt now supports native HTML5 input types for <a href="classWt_1_1WDateEdit.html" target="_blank">WDateEdit</a> and <a href="classWt_1_1WTimeEdit.html" target="_blank">WTimeEdit</a>.
You can enable it by using <a href="classWt_1_1WDateEdit.html#a388105e077d60a7225564572cae51a93" target="_blank">WDateEdit::setNativeControl(true)</a> or
<a href="classWt_1_1WTimeEdit.html#a747741116664abc07f820122d05a535f" target="_blank">WTimeEdit::setNativeControl(true)</a>
for <code>WDateEdit</code> and <code>WTimeEdit</code> respectively. Both are set to false by default.
Native controls will use the locale of the browser to determine the format displayed to the client.
They have a better responsive design than Wt's widgets, often deferring to a pop-up on small screens for example.
</li>
<li>
<a href="https://redmine.emweb.be/issues/12789" target="_blank">Issue #12789</a>:
this feature allows you to force the tooltip from a