user32: ClipCursor should use virtual screen resolution for empty/invalid rects.

[Vitaliy Margolen]

Change Log:
  ClipCursor should use virtual screen resolution for empty/invalid rects.
  Make x11drv call reset clip rect on screen resolution changes.

If the rect passed to ClipCursor is empty, NULL or invalid, use virtual screen
resolution to reset clip rect to. I took out addition of the ClipCursor to the
x11 driver. I will need it later on for something different.

Also these tests pass on Windows with multi-monitor config.
I could not reliably run tests on Wine with xinerama configuration.

---
 dlls/user32/cursoricon.c    |   19 +++++++++++--------
 dlls/user32/tests/monitor.c |   27 +++++++++++++++++++++++++++
 dlls/winex11.drv/winpos.c   |    1 +
 3 files changed, 39 insertions(+), 8 deletions(-)
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