Created attachment 120484 [details] Tab bar text not fading STEPS TO REPRODUCE 1. Go to System Settings > Colors 2. Edit the current color scheme 3. Check "Apply Inactive window effects" 4. Go to the "inactive" tab, change "Contrast" to "Fade" and move the slider a ways to the right 5. Open Konsole and add more tabs OBSERVED RESULT The tabs' text does not fade when the window becomes inactive EXPECTED RESULT The text should fade ADDITIONAL INFORMATION This is a blocker for https://phabricator.kde.org/T10201 The fading effect works with standard Qt tab bars in Dolphin and Okular, so I think it's an issue specific to Konsole rather than a generic issue with applying the effect to a QTabBar. SOFTWARE/OS VERSIONS Everything from git master
This is probably caused by the CSS feature (which was used to colorize tab texts depending on state).
Yep, you're right: it's the custom stylesheet for the tabs, which breaks various other things too, such as re-drawing dynamically in response to color and font changes.
Fixed by porting away from the use of a Qt stylesheet.