imm32: Improve ImmGetCompositionString.

[Aric Stewart]

It should return number of copied bytes. But it always returns required
buffer size to receive all information.
(originally by Kusanagi Kouichi (slash at ma.neweb.ne.jp) )
---
  dlls/imm32/imm.c |  207 
++++++++++++++++++++++++++++++++++--------------------
  1 files changed, 130 insertions(+), 77 deletions(-)


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