SUMMARY When using a dark theme, the inactive tabs in a tabbar are very hard to distinguish from the active tab. A cursory look through the code shows the active tab uses the Window Normal Background, and the inactive tabs use a slight darken filter on that color. On dark themes, the difference is lost. STEPS TO REPRODUCE 1. select (very) dark theme 2. observe tabs in System Settings/Application Style for Breeze SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION
Largely the same issue as Bug 356037, which is being worked on. *** This bug has been marked as a duplicate of bug 356037 ***