claude advertises "Jump to bottom (ctrl+End)", so that chord has to actually
reach it. But PASSTHROUGH_KEYS carried only the bare forms (End -> \x1b[F) and
CTRL_KEYS held just six letters (c/d/l/z/a/e), which cannot express End. Ctrl+End
therefore failed in both directions:
- with an empty composer it went out as a bare \x1b[F, the modifier silently
dropped, so the CLI received a plain End;
- with text in the composer the forwarding branch requires empty, so nothing was
forwarded and the browser default applied — the caret jumped to the end of the
draft, which is the "the shortcut now edits my input box" the user saw.
Encode them as CSI 1;<mod><final> instead, and forward Ctrl/Alt-modified
navigation keys whether or not the composer is empty: they are commands for the
CLI, and the composer has no editing semantics for them worth preserving (bare
Home/End still use the old table and edit locally).
⚠️ Bare Shift is deliberately excluded: Shift+arrow selects text in the composer,
a real editing gesture that must stay local. Shift held together with Ctrl/Alt is
still encoded into the modifier mask.
(cherry picked from commit 3fbaadadfb)
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