Add column selection for vertical multi-caret

[Copilot]

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[tig]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Resolved the merge conflicts and pushed the updated branch. The true develop merge commit is 4e2cfe8, with follow-up validation cleanups through 9531cd8.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• www.jetbrains.com
  • Triggering command: /usr/share/dotnet/dotnet /usr/share/dotnet/dotnet exec --runtimeconfig /home/REDACTED/.nuget/packages/jetbrains.resharper.globaltools/2026.1.1/tools/net8.0/any/cleanupcode.unix.runtimeconfig.json /home/REDACTED/.nuget/packages/jetbrains.resharper.globaltools/2026.1.1/tools/net8.0/any/cleanupcode.exe Terminal.Gui.Editor.slnx --include=src/Terminal.Gui.Editor/Editor.Drawing.cs;src/Terminal.Gui.Editor/Editor.Keyboard.cs;src/Terminal.Gui.Editor/Editor.Mouse.cs;src/Terminal.Gui.Editor/Editor.MultiCaret.cs;src/Terminal.Gui.Editor/Editor.cs;tests/Terminal.Gui.Editor.IntegrationTest (dns block)

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