Gesture hover tracking broken for buttons
It seems that sometimes we loose track of what widget has the mouse focus and send thing to the wrong widget.
For example in the overlay->transparency gtk-demo:
- click on the upper button
- drag (with mouse button down) you drag down to second button
- release button (without accidentally moving the cursor)
- click again, now over the 2nd button
In this case the final click still goes to the first button. Moving the cursor fixes this though.