imm32: implement XIMPreEditCaretCallback

[Nigel Liang]

Hi,

This patch implements XIMPreEditCaretCallback and fixes bug 8937.

-Nigel
--
 user32/edit.c     |    4 +++
 winex11.drv/xim.c |   57 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 60 insertions(+), 1 deletion(-)
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