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Found while verifying Auto Copy in a browser: a plain left click in a
claude/codex/gemini pane sent a synthetic SGR mouse report into the PTY
whether or not the program in that pane had ever enabled mouse tracking.
When the pane holds a plain shell (the CLI exited, or a shell was started
inside a session of that mode) readline prints the report as literal text
and it garbles the next line typed:
$ [<0;88;20Mecho hello
bash: 0: No such file or directory
The cause is that the browser could not know. The full strip
(isAltScreenStripMode) removes the mouse DECSETs from the stream, so
xterm's modes.mouseTrackingMode is permanently 'none' for those modes and
_sendSyntheticSgrTap() hand-encodes reports to stand in for xterm's own
encoder. With no state to consult it had to do that on every click.
What the strip removes, the server now remembers.
_recordStrippedMouseMode() records each sequence as it is stripped,
toState() publishes it as cliMouseTracking, and the browser's
_shouldReportMouseToCli() (renamed from _sessionUsesServerMouseStrip)
requires it at all three report sites: the desktop click, the touchend
tap, and the mobile tap classifier.
Details that are easy to get wrong:
* Only the tracking modes count (1000/1001/1002/1003). 1005/1006 select
an encoding and 1007 is alt-scroll; a CLI that picks SGR encoding
without turning tracking on is not asking about clicks, and counting
those would put the stray reports straight back.
* Modes are held in a Set, so a TUI disabling a mode it never enabled
cannot clear the ones that are really on.
* The change broadcasts immediately instead of through
broadcastSessionStateDebounced: the flag flips when a dialog opens, and
the user can click that dialog well inside the 500ms debounce window.
* It fails toward silence. After a server restart the flag is false until
the CLI re-emits its DECSET, which tmux does at client attach.
Verified against a live claude 2.x session: the CLI holds a tracking mode
on continuously, so its clicks are still reported byte for byte as
before, while a bash prompt in the same stripped mode now reports
nothing and types cleanly. The flag also propagates live over SSE in both
directions, checked by toggling ?1002h/?1002l from inside the pane.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>