Based on the wine-staging patch winex11-CandidateWindowPos from Felix Yan with works from
Muneyuki Noguchi and Sebastian Lackner.
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v2: win32u: Set host IME composition window position in NtUserShowCaret().
win32u: Set host IME composition window position in set_caret_pos().
win32u: Support setting host IME composition window position for ImmSetCompositionWindow().
https://gitlab.winehq.org/wine/wine/-/merge_requests/6286