When you have an image modified, and view pictures in fullscreen, and then close Gwenview, the resulting dialog is using a dark widget theme. Reproducible: Always Steps to Reproduce: 1. Open a picture in Gwenview 2. Modify it, eg. rotate it 3. Go to fullscreen mode 4. Press Alt+F4 or Ctrl+Q to exit Gwenview Actual Results: A confirmation dialog pops up that prompts if you want to discard your changes. This dialog is using a dark widget theme, though. Expected Results: The dialog pops up with the theme the user has configured.
Created attachment 74331 [details] Dialog with wrong widget theme
All the dialogs and file pickers created while in full screen use the dark theme. This seems intentional, seeing as how full screen itself intentionally switches to the dark theme irrespective of what theme the user has chosen. *** This bug has been marked as a duplicate of bug 338822 ***