Nested scrollbars are currently broken in regard to the wheel event. When you try scrolling the inner scrollbar the outer scrollbar is also scrolled.
Stopping the wheel event makes this work as expected. I'm not sure if / what drawbacks could this introduce, for my testcase this seems to work just fine.
Coverage decreased (-0.45%) to 53.94% when pulling 171d1b85586e9ff6400c0915674ebb5323eeafdc on andreieftimie:master into 18684037f7f736e85526c05701125b08376d3e71 on wieringen:master.
Nested scrollbars are currently broken in regard to the wheel event. When you try scrolling the inner scrollbar the outer scrollbar is also scrolled.
Stopping the wheel event makes this work as expected. I'm not sure if / what drawbacks could this introduce, for my testcase this seems to work just fine.