Hello, We do have window preview functions in Plasma5/KWin. I see this especially when OpenGL apps are open (you can see it best on OpenGL apps), but it happens in normal circumstances as well. It seems as if a complete screen repaint is triggered (can be seen because windows turn black and get re-painted) when you go over a task in the taskbar, wait for the preview to appear, and switch to a 2nd task in the taskbar (just hovering it, not actually switching to the other application). At the switch, it seems as if the complete screen is repainted - decorations and elements in the windows. I tested it on NVidia and Intel HD3000 in KUbuntu 15.04 beta1, but had the same experience on Archlinux with Arch packages. Reproducible: Always Steps to Reproduce: 1. Open an app (best seen with a OpenGL app), maximize it 2. Open a 2nd app, and switch back to the OpenGL app 3. Hover the OpenGL app in the taskbar until preview appears 4. Move the mouse to the 2nd task bar entry. Actual Results: When the preview of the 2nd window is shown, it seems to trigger a complete screen repaint. Expected Results: Not a complete screen repaint? Actually it's more an enquiery if this is really necessary, it's annoying if a whole window turns black for like a few hundred ms (enough to see it properly) until the content is displayed again. It's "not sexy" ;-). Currently (I think!) there is no workaround, since I couldn't find the option to turn off the preview function :D.
You should not see a screen repaint and that should esp. not turn anything black. Is the taskbar, preview or titlebar still visible or does the entire screen turn black? Is the pointer still visible? Please attach the output of qdbus org.kde.KWin /KWin supportInformation
Georg I'm unable to reproduce this issue on the latest Plasma from git master. Can you please test and confirm if this issue is still occurring or if this bug report can be marked as resolved. I'm setting status to "needsinfo" pending your response, please change back to "reported" or "resolved" when you respond, thanks. If the issue does persist please provide the info requested in Comment 1.
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please mark the bug as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!