Created attachment 183774 [details] Bug SUMMARY When using arrow keys to switch files, the image on the preview panel increases brightness instead of switching to the next one. It's only reproducible when doing it fast STEPS TO REPRODUCE 1. Open dolphin 2. Enable the side panel 3. Enable file preview 4. Change files with arrow keys fastly OBSERVED RESULT Image increases brightness until it's fully white EXPECTED RESULT Images just switch SOFTWARE/OS VERSIONS Linux: Arch Linux KDE Plasma Version: 6.4.3 KDE Frameworks Version: 6.16.0 Qt Version: 6.9.1 ADDITIONAL INFORMATION
A possibly relevant merge request was started @ https://invent.kde.org/system/dolphin/-/merge_requests/1057
I have reproduced the issue and submitted a merge request.
Git commit 96019a8592788932443fe0d0efc8ea44af2cf948 by Pan Zhang. Committed on 28/09/2025 at 04:12. Pushed by meven into branch 'master'. informationpanelcontent: prevent repeated disabled effect on previews When switching files quickly in the Information Panel, the preview pixmap could appear progressively brighter/whiter. This happened because markOutdatedPreview() was applying KIconEffect::toDisabled() multiple times on the same pixmap while a preview job was still pending. This patch fixes the issue by: - Tracking the URL that was last disabled, and only applying the disabled effect once per URL. - Clearing the disabled state whenever a new preview job starts or when a new pixmap is shown. With this change, the "disabled preview" effect is preserved (still useful for slow HDD or network filesystems), but the progressive white-out artifact no longer occurs when navigating rapidly. M +14 -2 src/panels/information/informationpanelcontent.cpp M +1 -0 src/panels/information/informationpanelcontent.h https://invent.kde.org/system/dolphin/-/commit/96019a8592788932443fe0d0efc8ea44af2cf948