fix: abnormal issues during IME composition input #9866
+83
−62
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What this PR does / why we need it:
The composition of IME expects input to be reflected immediately in the document. The delay caused by Vim's controls interferes with the normal operation of IEM composition. I believe we don't need to intercept IME composition input in insert mode.
Which issue(s) this PR fixes:
#9864, #7417, #2607, #9531