Exercise the Hangul-to-Hanja composition sequence through the public editor
bindings. Keep previews out of saved content and history, then restore the
styled source selection with one undo and the converted content with redo.
Cover both writing directions and Korean wrapping modes.
Verify native Fcitx Hangul conversion in all four showcase examples and
confirm the saved examples survive reopening.
AI-assisted-by: GPT-6
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