winex11.drv: Allow grabed window belonging to a different thread in send_mouse_input.

[Jacek Caban]

Signed-off-by: Jacek Caban <jacek at codeweavers.com>

If we call XGrabPointer on a window belonging to a different thread, we
may end up handling its events with different display and being unable
to associate X11 window with HWND.
---
 dlls/winex11.drv/mouse.c  | 30 +++++++++++++++++++-----------
 dlls/winex11.drv/window.c |  5 ++++-
 dlls/winex11.drv/x11drv.h |  1 +
 3 files changed, 24 insertions(+), 12 deletions(-)


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