Partial #2975 - Deprecate v1 Menu classes

[tig]

Fixes

• Partial Modernize Menu - Base on Bar and address litany of issues #2975
  • Fixes HighlightStyle.Hover causes ColorScheme issues #4014
  • Fixes Add events for GetNormalColor etc.... #4016

Proposed Changes/Todos

• Fix UICatalog bugs in v2win/v2net
• Add Fluent menubarv2 tests
• Mark v1 classes as obsolete
• Fix HighlightStyle.Hover causes ColorScheme issues #4014
• Fix Add events for GetNormalColor etc.... #4016

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

[tig]

In the above the Diagnostics menu's FlagSelector menu item has been tweaked to do the right thing.

The other two menus exhibit the old, broken behavior.

[Copilot]

Copilot reviewed 49 out of 49 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

Terminal.Gui/Views/FlagSelector.cs:437

• The condition in the UncheckNone method unchecks all checkboxes except those labeled 'None', which may be unintended. Consider changing the condition to check for equality ('sv.Title == "None"') to only uncheck the 'None' checkbox.

foreach (CheckBox cb in SubViews.OfType<CheckBox> ().Where (sv => sv.Title != "None"))

Terminal.Gui/Views/Menu/PopoverMenu.cs:408

• [nitpick] If the commented-out border styling code is no longer needed, consider removing it for clarity. Otherwise, add an explanatory comment describing its retention.

//menu.Border.Thickness = new (1);

[BDisp]

@tig just a few things I want to ask if you'll handle them in this PR:

• Menu stays always open when clicked second time. F9 work as expected closing the menu when pressing F9 second time.
• Menu radio botton aren't checked after click in the UICatalog themes.

[tig]

@tig just a few things I want to ask if you'll handle them in this PR:

• Menu stays always open when clicked second time.

The current behavior is a known bug. See:

• F9 work as expected closing the menu when pressing F9 second time.

Will do.

• Menu radio button aren't checked after click in the UICatalog themes.

You need to be more clear. I don't understand what you are suggesting.

[BDisp]

You need to be more clear. I don't understand what you are suggesting.

In the UICatalog if you click in the Dark theme for i.e. the radio button wont be flagged as checked.

[tig]

You need to be more clear. I don't understand what you are suggesting.

In the UICatalog if you click in the Dark theme for i.e. the radio button wont be flagged as checked.

Ahhh. Yep, thats one of the bugs that led me to realize I had some deep design errors that needed to be corrected.

[tig]

This PR is stale. Closing.