[PATCH v4 6/6] winex11.drv: Only call XWarpPointer if we can get exclusive pointer grab

[Rémi Bernon]

XWarpPointer will always succeed, regardless of grabs, so if the pointer
is already grabbed, by some other application, we should not ask to warp
it.

Signed-off-by: Rémi Bernon <rbernon at codeweavers.com>
---
 dlls/winex11.drv/mouse.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/dlls/winex11.drv/mouse.c b/dlls/winex11.drv/mouse.c
index fff6fc7047f..8d1dc5e35d7 100644
--- a/dlls/winex11.drv/mouse.c
+++ b/dlls/winex11.drv/mouse.c
@@ -1467,8 +1467,21 @@ BOOL CDECL X11DRV_SetCursorPos( INT x, INT y )
         return FALSE;
     }
 
+    if (!clipping_cursor &&
+        XGrabPointer( data->display, root_window, False,
+                      PointerMotionMask | ButtonPressMask | ButtonReleaseMask,
+                      GrabModeAsync, GrabModeAsync, root_window, None, CurrentTime ) != GrabSuccess)
+    {
+        WARN( "refusing to warp pointer to %u, %u without exclusive grab\n", pos.x, pos.y );
+        return FALSE;
+    }
+
     XWarpPointer( data->display, root_window, root_window, 0, 0, 0, 0, pos.x, pos.y );
     data->warp_serial = NextRequest( data->display );
+
+    if (!clipping_cursor)
+        XUngrabPointer( data->display, CurrentTime );
+
     XNoOp( data->display );
     XFlush( data->display ); /* avoids bad mouse lag in games that do their own mouse warping */
     TRACE( "warped to %d,%d serial %lu\n", x, y, data->warp_serial );
-- 
2.23.0.rc1