SUMMARY: Window becomes blurry when dragged from toolbar or CSD in Wayland with Plasma Invert effect STEPS TO REPRODUCE: 1. Enable the Plasma Invert effect in System Settings > Workspace > Desktop Effects 2. Press the keyboard shortcut to activate the effect (default: Meta+Ctrl+I) 3. Open an application. 4. Drag the window from the toolbar or CSD area OBSERVED RESULT The window becomes blurry and hard to read when dragged from the toolbar or CSD area. Dragging the window from the titlebar area removes the blurriness and the window becomes normal again. EXPECTED RESULT The window should remain clear and readable when dragged from any area of the window. SOFTWARE/OS VERSIONS Linux/KDE Plasma: OpenSUSE Tumbleweed (available in About System) KDE Plasma Version: 5.27.1 KDE Frameworks Version: 5.103.0 Qt Version: 5.15.8 ADDITIONAL INFORMATION • This issue occurs with the Plasma Invert effect enabled and activated. • The issue only occurs when dragging windows from the toolbar or CSD area, not from the title bar. • Disabling the Plasma Invert effect resolves the issue.
Additional Information: I have discovered that this blurriness issue also occurs with the Wobbly Windows effect enabled. When I drag the window from the toolbar or CSD area with the Wobbly Windows effect enabled, the window becomes blurry just like with the Plasma Invert effect. However, the blurriness disappears once the window is finished dragging, and the window becomes normal again. Dragging the window from the titlebar with the Wobbly Windows effect enabled does not cause any blurriness. Thank you.
Can't reproduce in the upcoming 5.27.3. Can you check again once it's released in a about a week? Thanks a lot!
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Still happens in Plasma 5.27.3. This does not happen with xwayland apps. Here is a screen recording (View in maximum quality.) - https://www.dropbox.com/s/zgczkpzj8meero7/Plasma%20Blurriness.mp4?dl=0
Still happens with Plasma 5.27.4
Also happens with the Overview effect and Desktop Grid effect. Here are some screenshots, Desktop Grid Before dragging by the toolbar - https://imgur.com/a/5aPHJIq After dragging by the toolbar - https://imgur.com/a/qOPjIsh Overview Before dragging by the toolbar - https://imgur.com/a/IDJcFrB After dragging by the toolbar - https://imgur.com/a/NWiQXuN
Can confirm with 200% scale. Are you using a scale higher than 100% as well?
Nope. I use 100% scaling.
RESOLVED: Deleting the kwinrc config file solved the issue. I created a new user account to check if the same thing happens there. But it didn't. So I tried deleting the kwinrc config file in my original account. It resolved the problem. Thanks!
Cool, I guess there was some old config value in there or something.
Hey, I found that happens when both "Screen edge snap zone" and "Window snap zone" settings in Window Management --> Window Behaviour --> Movement are set to "none". Deleting the kwinrc file made them reset to the default setting. (default is 10px) So it fixed the problem. But changing them again to "none" causes the problem again. I got my preferred behavior by setting them to 1px. But I thought it would be a good idea to report this.
>RESOLVED: Deleting the kwinrc config file solved the issue. FWIW, there's a similar bug at https://bugs.kde.org/show_bug.cgi?id=470607 so lets close this for now