Created attachment 175246 [details] Recording of behavior SUMMARY The new wallpapers KCM does not support fading in the new wallpaper when a new selection is made unlike the "old" way of settting the wallpaper, which was a really nice touch. STEPS TO REPRODUCE 1a. Open wallpapers KCM 2b. Select new wallpaper vs. 1b. Open desktop settings via right-click menu on desktop 2b. Select new wallpaper OBSERVED RESULT When selecting a new wallpaper in the desktop settings window, a nice transition shows the new wallpaper in effect before clicking apply. When selecting a new wallpaper in the wallpaper KCM, no effect is shown and the new wallpaper is applied without transition when clicking apply. EXPECTED RESULT Upon selecting a new wallpaper in the wallpapers KCM, a transition to the selected wallpaper occurs before clicking apply. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Fedora KDE 40 KDE Plasma Version: 6.2.1 KDE Frameworks Version: 6.7.0 Qt Version: 6.7.2
Technical details: The wallpaper kcm uses dbus to send wallpaper configuration plasmashell process. The plasma wallpaper window is able to change directly within plasmashell process the wallpaper (with the animation) without affecting the wallpaper settings. We would need to change the dbus interface to mimic this, have a "setWallpaperPreview" that changes the wallpaper without changing the settings. The initial kcm implementation would be a pointer where to plug the things together: https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/3395