Clicking page control area of QScrollBar causes flash of gray

[AAhusk]

Clicking in the scroll area outside of the scrollbar handle, in order to move the scrollbar by a page, often causes the area between the scrollbar and one edge to flash a dark gray. It's kind of like a dark gray scrollbar appears briefly. If I hold the click, instead of immediately releasing, it seems to stay a little longer, which allowed me to get a screenshot of it.

I'm just using a QScrollArea and Qt 5.12.0. Is this an unavoidable issue that just means the computer is a little slow to update the scrollbar, or something? Or an issue that requires updating to Qt 5.15 LTS? I did change the stylesheet for QScrollBar, as you can see in the screenshots, but the issue happened even without stylesheet changes.

The gray bar to the right of the actual scrollbar(blue) temporarily appears, and quickly disappears, leaving the space white again.

[SGaist]

Hi and welcome to devnet,

Isn't that just the movement direction feedback of the scrollbar ?

[AAhusk]

@SGaist I'm not familiar with "movement direction feedback", but it very well could be that.