[Bug 43904] HeTeMuLu Creator: Can't input some kanji characters properly.

https://bugs.winehq.org/show_bug.cgi?id=43904

--- Comment #1 from Sagawa  ---
Created attachment 59533
  --> https://bugs.winehq.org/attachment.cgi?id=59533
proposed patch

I found out this is due to WM_IME_COMPOSITION handling. I attach a proposed
patch.

In detail, HeTeMuLu WM_IME_COMPOSITION handler reads the result buffer after
calling CallWindowProc. On the other hand, when wine's IME handler (in
winex11.drv/ime.c or winemac.drv/ime.c) receives WM_IME_COMPOSITION, it clears
the result buffer after sending WM_IME_CHAR messages. However, the native keeps
the result buffer.

I made a patch for fixing this point. HeTeMuLu works fine with the patch!