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With Apple Korean 2-Set on macOS 14, Space with no syllable in progress
(a second space, or a space after a digit or punctuation) makes AppKit
call setMarkedText(" "), insertText(" "), then setMarkedText(""). winit
reports the insertText as Ime::Commit(" "), but the trailing empty
setMarkedText returns its state to the ground state, so keyDown also sends
the key as KeyboardInput with text " ". egui inserts both, and PdfCraft's
text fields got two spaces (the double space of alacritty/alacritty#8079).
vendor/winit now records that the key being handled committed IME text and
then doesn't also send it as KeyboardInput, unless AppKit forwards it as a
command through doCommandBySelector (Enter after a syllable still commits
the syllable and sends Enter). keyDown consumes the record on every key,
so keys typed after IME is disallowed are unaffected.
rust-windowing/winit#4478 aims at the same double space, but its changes
(clearing the marked text on commit, forwarding a later insertText, and
dropping doCommandBySelector's guard) don't reach this call order, and the
key loss it also fixes is already fixed by the previous change
(pending_commit). This is the narrow form for the call order observed
here; it should go upstream with #4478.
Checked with the real input methods on macOS 14.7.1 (scratch winit app, on top
of the previous change): the duplicate KeyboardInput Space is gone and
nothing else changes (Korean syllables, 한+Enter, 한+5, Japanese, Cangjie,
ABC, held keys, keys after IME is disallowed). A test fails if a
re-vendored winit loses the patch.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>