"DesktopWindowXamlSource" appears in taskbar if ("Compatibility") headless and "Startup" > "New Instance Behavior" set to ANYTHING OTHER THAN "Create new window"

[carlos-zamora]

Windows Terminal version

v1.22.10731.0 (Stable)

Windows build number

Windows 10 - Version 10.0.19045.5608

Other Software

Microsoft PowerToys is not installed.

Steps to reproduce

Originally a part of #18784

While enabling "Compatibility" option in the latest stable release [v1.22.10731.0], the ghost "DesktopWindowXamlSource" window does not appear in taskbar as long as "Startup --> (New Instance Behavior) is set to (Create new window)", otherwise if it set to any of the 2 other options, once WT closes, it can never be opened again until...

1. Open "Task Manager"
2. search for "Windows Terminal" in "Background Processes"
   3 End it.
3. then open WT again.

Related to the ghost "DesktopWindowXamlSource" window mentioned in #18784

The "Compatibility" option allows for quick launch of WT, say an average of 0.0800s with "Compatibility" option enabled vs cold launch of 0.3100s with "Compatibility" option disabled vs "%SystemRoot%\system32\cmd.exe" launch of 0.0460s. (Calculated using PassMark AppTimer).

The "Compatibility" option is crucial for smooth experience but unfortunately it is completely fucked up in Stable, Preview & Canary releases.

Please see this video for more clarification (The video demonstrate the "Compatibility" & "New Instance Behavior" options conflict on Portable mode only on all releases).

Expected Behavior

"DesktopWindowXamlSource" should never be exposed.

Actual Behavior

"DesktopWindowXamlSource" is exposed

[similar-issues-ai]

We've found some similar issues:

• Ghost window (DesktopWindowXamlSource) still appears in the Taskbar (See #6507 - #6861 - #16183 - #15047 - #15165 - #15402) #18784 , similarity score: 90%

If any of the above are duplicates, please consider closing this issue out and adding additional context in the original issue.

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