Dragging widgets in headerbar with touch drags the window instead
The most noticeable case here is selecting text in entries, which fails as follows:
Screencast_from_02-11-20_17_04_44
Other cases:
- Dragging a switch
- Dragging from a button (dragging the window here is expected, but it leaves the button in active state)
It seems it's caused by the touch pointer emulation synthetic events, which lack an event sequence and so aren't blocked when that sequence is denied.