V2 4893 kitty keyboard shifted fix

[BDisp]

Fixes

• Fixes Kitty keyboard protocol: shifted printable CSI u keys are delivered as shifted base keys instead of printable text #4893

Proposed Changes/Todos

• Enable kitty ReportAssociatedText support in the requested keyboard flags.
• Parse kitty associated-text payloads and carry them through Key.
• Prefer associated text, then shifted kitty metadata, when resolving printable text from Key.
• Normalize shifted printable kitty sequences so input like shifted digits inserts the produced character instead of the physical key code.
• Add and update parser, keyboard, TextField, TextView, and TextValidateField tests to cover shifted printable behavior and associated text handling.

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]

Thanks for fixing this. I noticed something odd the other day with the ansi driver in this regard and immediately forgot about it because I needed to use the windows driver to test something else and never switched back.

[Copilot]

Pull request overview

Fixes kitty keyboard protocol handling so shifted printable CSI u keys and kitty “associated text” are preserved and normalized into printable Key semantics, improving text-entry behavior across views.

Changes:

• Request kitty ReportAssociatedText and parse associated-text payloads in KittyKeyboardPattern.
• Normalize shifted-printable kitty sequences so keys like Shift+2 resolve to '@' (not base key + Shift).
• Add/update unit tests across keyboard parsing, Key printable resolution, and text-entry views.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Terminal.Gui/Input/Keyboard/Key.cs	Adds AssociatedText, updates printable resolution (AsRune), and introduces GetPrintableText/TryGetPrintableRune.
Terminal.Gui/Drivers/AnsiHandling/KittyKeyboardPattern.cs	Extends kitty CSI u parsing to extract associated text and normalizes shifted printable keys.
Terminal.Gui/Drivers/AnsiHandling/EscSeqUtils/EscSeqUtils.cs	Requests kitty ReportAssociatedText in the negotiated flags.
Tests/UnitTestsParallelizable/Input/Keyboard/KeyTests.cs	Adds tests for printable-text resolution preference order and multi-rune associated text behavior.
Tests/UnitTestsParallelizable/Drivers/AnsiHandling/KittyKeyboardParsingTests.cs	Updates fixtures to coherent US-keyboard examples; adds associated-text parsing and requested-flag assertions.
Tests/UnitTestsParallelizable/Drivers/AnsiHandling/KittyAlternateKeyTests.cs	Updates alternate-key fixtures and adds associated-text preservation tests.
Tests/UnitTestsParallelizable/Views/TextFieldTests.cs	Adds tests for associated-text insertion and shifted-digit behavior without kitty metadata.
Tests/UnitTestsParallelizable/Views/TextView.InputTests.cs	Adds test ensuring associated-text shifted printable inserts expected text.
Tests/UnitTestsParallelizable/Views/TextValidateFieldTests.cs	Adds test ensuring associated-text shifted printable is accepted by regex provider.

[tig]

Excellent work. Thank you.

[BDisp]

On Windows, I'm only capturing the shift key and nothing else. I tried with WezTerm and Rio. I don't know why this happens. Have you managed to get this working on Windows?

[tig]

On Windows, I'm only capturing the shift key and nothing else. I tried with WezTerm and Rio. I don't know why this happens. Have you managed to get this working on Windows?

Not sure what you mean.

[BDisp]

Which Windows Terminal version you're using?

[tig]

Windows Terminal Preview
Version: 1.25.622.0