[PATCH 4/4] winemac: Track drawn surface region to reduce black flicker for new or resized windows.

[Ken Thomases]

Technically, there's still almost as much flicker but some of it's off-white
window background color, which is less visually noticeable.
---
dlls/winemac.drv/cocoa_window.m |   10 +----
dlls/winemac.drv/macdrv.h       |    3 +-
dlls/winemac.drv/macdrv_cocoa.h |    2 +-
dlls/winemac.drv/surface.c      |   84 +++++++++++++++++++++++++++++++-------
dlls/winemac.drv/window.c       |    4 +-
5 files changed, 74 insertions(+), 29 deletions(-)

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