This is a general issue exposed by moving from tweak to click-drag
events [0], however this bug would have existed for both click &
click-drag events beforehand.
Since [1] the following behavior could occur:
- Click-drag the cursor away from the button.
- Leaving the button would flag it as disabled.
- The disabled button would then break
causing the event to be considered handled.
- Once handled no click / click-drag action would be tested.
The bug would only happen if the cursor left the button before the drag
threshold was reached which tended to happen with an UI-scale 2 or more.
Or with an increased drag threshold.
Revert [1] (fix for T78503), which is no longer needed since as of [2].
[0]: 4986f71848
[1]: 6f96dd8576
[2]: 87c13ac68c
fb87578698