winemac: Improve positioning of input method candidate window.

[Ken Thomases]

Use IMR_QUERYCHARPOSITION to get a better answer for our implementation of
-[NSTextInputClient firstRectForCharacterRange:actualRange:].
---
dlls/winemac.drv/cocoa_window.m |   28 +++++++++-
dlls/winemac.drv/event.c        |    4 +
dlls/winemac.drv/ime.c          |  123 +++++++++++++++++++++++++++++++++++++++
dlls/winemac.drv/macdrv.h       |    1 +
dlls/winemac.drv/macdrv_cocoa.h |    6 ++
5 files changed, 161 insertions(+), 1 deletions(-)

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