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Neil
d143922561
Picking a single Chinese character from the candidate window with a number key loses it. The character flashes and disappears. Picking the same candidate with the mouse works, and picking multi-character words with number keys works. Two paths can deliver an IME commit, and this falls between them. A keydown the input method consumed routes into a setTimeout(0) diff of the helper textarea, and that diff is what normally delivers the commit; xterm's _keyDownSeen guard exists to defer to it. When the commit arrives after that timer has already run, neither path delivers. Mouse selection works because no key is down, and a real composition session works because it takes a different path entirely. That narrows it to an input method whose commit round-trips asynchronously and which shows no in-application preedit. Track that a consumed keydown still owes its commit, and deliver only when the diff did not. The upstream guard and its single read site are untouched, which is what keeps the duplicate-commit behaviour it was added for sealed. Not doing the obvious repairs deliberately: clearing the flag, skipping it for keyCode 229, or setting it after the composition short-circuit each unblock the input path without retiring the diff, and all three were measured emitting the character twice. The patch and the lockfile hash here are generated. Review config/patches/xterm-src/@xterm__xterm@6.1.0-beta.287.src.patch, which is the hand-written source of the change; the shipped patch and both minified bundles are the regenerator's output from the pinned upstream build, so nothing in this change was hand-transcribed into a bundle. Refs xtermjs/xterm.js#6036 Closes #12099