System Settings' fancy category tooltips are QWidgets with 'Qt::ToolTip | Qt::FramelessWindowHint' set and blur behind. They ask the style engine to paint a QStyle::PE_PanelTipLabel with QPalette::ToolTipText as foreground role, which seems semantically sound to me. Something in QtCurve breaks them, though, causing the label not to show up and the background to bleed through. Reproducible: Always
Created attachment 87377 [details] Broken System Settings tooltip
I was using an outdated copy of QtCurve for this test; this appears to be fixed in current master. Yay!
Created attachment 87622 [details] System Settings category tooltip While contents show, the border/mask is broken, repurposing this ticket.
Resetting assignee.
Thank you for the bug report. As this report hasn't seen any changes in 5 years or more, we ask if you can please confirm that the issue still persists. If this bug is no longer persisting or relevant please change the status to resolved.