Update WindowManager.cs

[dotMorten]

Test PR. DO NOT MERGE

[github-actions]

API changes

namespace WinUIEx
{
    public class NewClass
    {
        public NewClass(string name);
        public string Name { get; }
    }
    public class WindowManager
    {
        public string NewStringProperty { get; set; }
        public NewMethod();
        public EventHandler? ZOrderChanged;
    }
}

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