Input events are deliberately skipped for the duration of an IME composition
(they carry uncommitted preedit text), so nothing clears the empty marker
until compositionend — the hint kept painting behind the hiragana the user was
composing. Drop the marker as composition starts; the normalizer restores it
if composition ends with nothing committed.
Taking the hint out of the text flow fixed the displacement half of #75960 on
its own — preedit now starts at the field's left edge either way — but the
overlap needed this too.
Co-authored-by: Ryuichi Natori <to-na@users.noreply.github.com>
Brooklyn Nicholson
93ec02bf79