Fix Ctrl-A in multiline terminal prompts

[sdaveas]

Description

Fixes terminal input Ctrl-A behavior for multiline prompts. Terminal input now opts into a line-start behavior where Ctrl-A first moves to the start of the current prompt line, and pressing it again from column 0 moves to the start of the previous prompt line. Other editor surfaces keep the existing current-line behavior.

This intentionally leaves Ctrl-E unchanged for now, with a TODO to revisit terminal-style line-end behavior separately.

Linked Issue

#10763

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Where appropriate, screenshots or a short video of the implementation are included below (especially for user-visible or UI changes).

Screenshots / Videos

Testing

• cargo fmt --check
• cargo test -p warp test_move_to_line_start_previous_line_when_at_start
• cargo test -p warp test_terminal_input_line_start_moves_to_previous_line_when_at_start
• cargo clippy --workspace --exclude warp_completer --all-targets --tests -- -D warnings
• cargo clippy -p warp_completer --all-targets --tests -- -D warnings

Validation was run on the remote laptop because the local laptop cannot build Warp without the full Xcode Metal toolchain.

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

CHANGELOG-BUG-FIX: Fixed Ctrl-A behavior in multiline terminal prompts to move by prompt line.

Co-Authored-By: Warp agent@warp.dev

[cla-bot]

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[sdaveas]

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[oz-for-oss]

@sdaveas

I'm starting a first review of this pull request.

You can view the conversation on Warp.

I reviewed this pull request and requested human review from: @kevinyang372.

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[oz-for-oss]

Overview

This PR adds a configurable editor line-start behavior and opts terminal input into moving to the previous prompt line when MoveToLineStart is invoked from column 0. The default behavior remains unchanged for other editor surfaces, and the added tests cover the editor option and terminal input path.

Concerns

• No blocking correctness or security concerns found in the changed lines.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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[kevinyang372]

@vkodithala Could you take over? This is an edit to terminal/input.rs

[vkodithala]

Hey @sdaveas - thanks for the fix, this looks awesome. Mind linking an issue on our public repo? If there isn't already one, feel free to file manually or via the /feedback slash command in Warp :)

[vkodithala]

Refer to previous comment re: missing linked issue! Will review once fixed.

[sdaveas]

Hey @sdaveas - thanks for the fix, this looks awesome. Mind linking an issue on our public repo? If there isn't already one, feel free to file manually or via the /feedback slash command in Warp :)

@vkodithala done! Created an issue and linked in the description.

[vkodithala]

Thanks so much! We just reviewed this and are looking for a little more info. For context, the decision to make Ctrl-A jump to the beginning of the current line was intentional, since we wanted to support IDE/text editor-style editing in our terminal input. Would like to see some examples of how other terminals do this to inform if we want to consider a change!

[vkodithala]

Feel free to re-request a review if and when the original issue is marked ready-to-spec/implement!