The chat panel renders via xterm.js, and when the inner Hermes TUI
enables mouse-events mode (CSI ?1000h family — used for nav inside
Ink overlays/pickers) every drag/double-click/triple-click in the
canvas is consumed by the terminal instead of producing a native
text selection. The reporter (macOS, Brave) confirmed:
- click-and-drag selects nothing
- Cmd+C with no selection copies the entire visible buffer
- existing CSS overrides and event handlers at the document layer
have no effect — the issue is at xterm.js's mouse layer, not the
DOM
Fix: two xterm.js options the user can opt into without disabling
mouse-events mode for the inner TUI:
- `macOptionClickForcesSelection: true` — holding Option (macOS)
or Alt (Linux/Windows) during a click-and-drag bypasses mouse-events
mode and produces a native xterm selection. This is the documented
xterm.js path for this exact scenario. Selected text is copyable
via Cmd+C / Ctrl+C through the existing OSC 52 + manual handlers.
- `rightClickSelectsWord: true` — right-click highlights the word
under the pointer. Single-action path on top of the modifier-based
bypass.
The two options coexist with the existing `macOptionIsMeta: true`
(which only affects keyboard, not mouse). No other code change
needed.
Fixes#25720.
8e3cfdfb61