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fix(predictive-echo): anchor hold after unpredicted wire edits (review findings)

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Independent post-build review found three gaps, all one family: input that
changes the composer without a prediction leaves the DISPLAYED cursor stale
for one RTT, and anchoring a new run on it painted ghosts one cell off
(blank-neutral, so they lived out the full TTL: "tehh" on
backspace-then-retype, exactly on the links the feature targets).

Fix: the addon now HOLDS new predictions after any such edit (backspace with
nothing outstanding = deleting echoed text, clearPredictions, and now also
IME/plain-paste 'text' commits, which the hook clears like 'clear') until
the next PARSED write releases the hold. The inline predictChar reconcile
deliberately does not count: only the emitter pass or the public
reconcile() is the display-caught-up contract. Worst case is exactly one
unpredicted keystroke, whose own echo releases the hold. Also patched the
one bypass path the PR had missed: _handleCjkInput now clears predictions
like insertTerminalText and the other bypass sends.

Package suite 230, vm gating 85, E2E 10/10 all green after the change.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Codeman maintainer
2026-08-09 05:29:45 +02:00
parent 55bff4a4bf
commit 9e7c537e14
9 changed files with 83 additions and 10 deletions
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packages/xterm-zerolag-input/README.md
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@@ -333,7 +333,12 @@ identical in-place repaint, never false-confirms). A cell showing foreign
non-blank content on two consecutive passes drops that prediction and all
later ones (one pass tolerates half-parsed frames). Blank cells are neutral:
they are what "not yet echoed" looks like. Whatever remains is dropped by TTL.
Scrolling up, resizing, or a sustained cursor move clears the run.
Scrolling up, resizing, or a sustained cursor move clears the run. After a
backspace into already-echoed text, a cleared input, or a multi-char commit,
the addon **holds** new predictions until the next parsed write: the displayed
cursor is stale for one round trip, and anchoring on it would paint ghosts one
cell off (worst case: exactly one unpredicted keystroke, whose own echo
releases the hold).
### API