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fix(tui): proactive mouse disable on ConPTY + /mouse toggle command

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On Windows WSL2, ConPTY implicitly enables mouse event injection when
the alternate screen buffer (DEC 1049) is entered, causing raw escape
sequences to appear in the transcript as ghost characters.

Fix (two parts):
1. ConPTY fix: send DISABLE_MOUSE_TRACKING immediately after entering
   alt screen when mouse tracking is off (AlternateScreen.tsx)
2. Runtime toggle: add /mouse [on|off|toggle] slash command with config
   persistence (display.tui_mouse) so users can manage this at runtime

The env var HERMES_TUI_DISABLE_MOUSE continues to work as the initial
default, but can now be overridden via /mouse and persisted to config.

Closes: upstream ConPTY mouse injection issue
Credits: OutThisLife / PR #13716 for the toggle concept
This commit is contained in:
Vesper (on behalf of Director) 2026-04-24 20:32:12 -07:00
parent 2182de55bb
commit 1c8ce33d51
9 changed files with 70 additions and 3 deletions
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17
ui-tui/packages/hermes-ink/src/ink/ink.tsx
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@ -1121,6 +1121,23 @@ export default class Ink {
this.repaint()
}
}
/**
* Toggle mouse tracking at runtime while the alt screen is active.
* Writes the appropriate DEC reset/set sequences so the terminal
* (and ConPTY on Windows WSL2) reflects the change immediately.
*/
setAltScreenMouseTracking(enabled: boolean): void {
if (this.altScreenMouseTracking === enabled) {
return
}
this.altScreenMouseTracking = enabled
if (this.altScreenActive) {
this.options.stdout.write(enabled ? ENABLE_MOUSE_TRACKING : DISABLE_MOUSE_TRACKING)
}
}
get isAltScreenActive(): boolean {
return this.altScreenActive
}