Fixes #4053. v2 WindowsDriver and v2win doesn't show any scenario in the UICatalog with cmd or conhost

[BDisp]

Fixes

• Fixes v2 WindowsDriver and v2win doesn't show any scenario in the UICatalog with cmd or conhost #4053

Proposed Changes/Todos

• Fixes WindowsDriver
• Fixes v2win, but still doesn't work using VS2022 debugger and doesn't resize well when the size was changed on another scenario and returning to the main app.

Pull Request checklist:

• I've named my PR in the form of "Fixes #issue. Terse description."
• My code follows the style guidelines of Terminal.Gui - if you use Visual Studio, hit CTRL-K-D to automatically reformat your files before committing.
• My code follows the Terminal.Gui library design guidelines
• I ran dotnet test before commit
• I have made corresponding changes to the API documentation (using /// style comments)
• My changes generate no new warnings
• I have checked my code and corrected any poor grammar or misspellings
• I conducted basic QA to assure all features are working

[BDisp]

This is ready for review. Thanks.

[Copilot]

Pull Request Overview

This pull request addresses issue #4053 by updating the WindowsDriver and v2win components so that scenarios display correctly in the UICatalog when using cmd or conhost. Key changes include enabling the HACK_CHECK_WINCHANGED define flag in multiple modules, refining the WindowsTerminal detection and handling logic, and updating the Force16Colors property in the V2 driver.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Terminal.Gui/ConsoleDrivers/WindowsDriver/WindowsMainLoop.cs	Added a define for HACK_CHECK_WINCHANGED to assist with window size changes.
Terminal.Gui/ConsoleDrivers/WindowsDriver/WindowsDriver.cs	Re-enabled HACK_CHECK_WINCHANGED and moved WindowsTerminal detection into a conditional block.
Terminal.Gui/ConsoleDrivers/WindowsDriver/WindowsConsole.cs	Updated usage of _screenBuffer and IsWindowsTerminal in various console operations.
Terminal.Gui/ConsoleDrivers/V2/WindowsOutput.cs	Adjusted Write method to account for Force16Colors in cursor visibility.
Terminal.Gui/ConsoleDrivers/V2/MainLoopCoordinator.cs	Introduced _isWindowsTerminal field based on environment variables.
Terminal.Gui/ConsoleDrivers/V2/ConsoleDriverFacade.cs	Modified Force16Colors property to reflect true color support.

Comments suppressed due to low confidence (1)

Terminal.Gui/ConsoleDrivers/WindowsDriver/WindowsConsole.cs:147

• [nitpick] Consider removing or archiving the commented-out code blocks (e.g., around screen buffer initialization) if they are no longer needed to improve code clarity.

//if (_screenBuffer == nint.Zero)