Preserve Editor cursor style when updating position

[Copilot]

Editor.UpdateCursor() forced CursorStyle.BlinkingBar every time it positioned the caret, overriding the user or terminal default cursor style. The editor should control cursor position/visibility without imposing a shape.

• Cursor update behavior
  • Preserve the existing cursor style while updating Cursor.Position.
  • Use CursorStyle.Default only when making a hidden cursor visible.

Cursor = Cursor with
{
    Position = screen,
    Style = Cursor.Style == CursorStyle.Hidden ? CursorStyle.Default : Cursor.Style
};

• Regression coverage
  • Added an integration test that verifies a configured cursor style survives a position update.
  • Relaxed the multi-caret exit assertion to require visibility instead of a hardcoded bar style.

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 --profile=TG.Editor Full Cleanup (dns block)
  • 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 (dns block)
  • 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;tests/Terminal.Gui.Editor.IntegrationTests/EditorRenderingTests.cs;tests/Terminal.Gui.Editor.IntegrationTests/EditorTests.cs (dns block)

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