winemac: Work around mouse "pausing" after CGWarpMouseCursorPosition().

dlls/winemac.drv/cocoa_app.m

@@ -1049,7 +1049,20 @@ int macdrv_err_on;
         {
             ret = (CGWarpMouseCursorPosition(pos) == kCGErrorSuccess);
             if (ret)
+            {
                 lastSetCursorPositionTime = [[NSProcessInfo processInfo] systemUptime];
+
+                // Annoyingly, CGWarpMouseCursorPosition() effectively disassociates
+                // the mouse from the cursor position for 0.25 seconds.  This means
+                // that mouse movement during that interval doesn't move the cursor
+                // and events carry a constant location (the warped-to position)
+                // even though they have delta values.  This screws us up because
+                // the accumulated deltas we send to Wine don't match any eventual
+                // absolute position we send (like with a button press).  We can
+                // work around this by simply forcibly reassociating the mouse and
+                // cursor position.
+                CGAssociateMouseAndMouseCursorPosition(true);
+            }
         }
 
         if (ret)