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Win32: fix window commits last char when deleting text with IME #32565
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Similar problem to flutter/flutter#92132 is occured by using Google Japanese Input, and Microsoft Japanese IME.
In this case, a WM_IME_COMPOSITION message with zero lparam is posted. (this behavior is documented in https://docs.microsoft.com/en-us/windows/win32/intl/wm-ime-composition)
This PR adds processing this.
Fixes: flutter/flutter#101953
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flutter/tests.Pre-launch Checklist
writing and running engine tests.
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