If I move applications between desktops using the Desktop grid effect they disappear at the moment when I press over it's windows to drag them to another desktop. When I release it the window it will appear again. This only happens if the window is unmaximized, if the window is maximized the window doesn't disappear. Reproducible: Always Steps to Reproduce: 1. Have an unmaximized application opened. 2. Press CTRL + F8 to activate the Desktop grid effect. 3. Press over the window to drag to another desktop. Actual Results: The window will disappear. Expected Results: The window shouldn't disappear while dragging it. Currently I'm using Debian unstable with KDE 5.6.4, and frameworks 5.23 with Qt 5.6.1 and Intel display drivers. This bug is present in X11 and Wayland sessions. Also I could reproduce it on an Arch Linux system with the same versions using the nVidia propietary drivers.
*** Bug 370912 has been marked as a duplicate of this bug. ***
The duplicate bug report has a nice video linked.
*** Bug 374607 has been marked as a duplicate of this bug. ***
*** Bug 374878 has been marked as a duplicate of this bug. ***
Still present in plasma 5.9. Almost filed a duplicate :)
I meant to add that this does not happen with all windows. E.g. kmail, kate, and firefox don't disappear. However, konsole, dolphin, system settings and steam do.
MichaelD have you checked if kmail, kate, and firefox windows are maximized? Because if they are, any window that is maximized don't disappear, but if they are not maximized is where they disappear. I tested also with Plasma 5.9 and still happens as described in the original report.
None of my windows are maximized.
This problem occurs only if the flag "Use present windows effects to layout the windows" is checked under system setting configuration ("desktop effects" / "desktop grid").
*** Bug 377990 has been marked as a duplicate of this bug. ***
*** Bug 383186 has been marked as a duplicate of this bug. ***
This bug is still reproducible on 5.12 (Kubuntu 18.04)
Any progress? The bug is still here...
It looks like this bug is reproducible only when using the Present Windows effect to layout windows.
(In reply to antonio.guadagnin from comment #9) > This problem occurs only if the flag "Use present windows effects to layout > the windows" is checked under system setting configuration ("desktop > effects" / "desktop grid"). Oh, didn't notice it.
Git commit 91b538105ad312ed035fb7a0e3d798e88a2ae6f7 by Vlad Zagorodniy, on behalf of Erik Kurzinger. Committed on 26/10/2018 at 08:19. Pushed by vladz into branch 'Plasma/5.14'. [effects/desktopgrid] Specify screen projection matrix when drawing moving window Summary: Currently, when the user is moving a window in the desktop grid it is drawn from the paintScreen function to ensure it appears above all other windows. However, when drawing the window, the screenProjectionMatrix for the WindowPaintData structure is never specified. Because of this, the window will not be visible if OpenGL compositing along with Lanczos scaling are in use since its coordinates will never be projected into screen-space (unless the window is maximized, in which case the scaling code is bypassed). Related: bug 361371 FIXED-IN: 5.14.3 Test Plan: Ensure OpenGL compositing is enabled and the scaling method is set to "Accurate" on hardware supporting this option. Additionally, ensure the desktop grid effect is active and is configured to use Present Windows. Open a window and ensure is it not maximized. Click on the window and drag it around - its contents should remain visible the entire time and follow the mouse. Reviewers: #kwin, zzag, graesslin, davidedmundson Reviewed By: #kwin, zzag, davidedmundson Subscribers: broulik, davidedmundson, kwin, #kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D16430 M +1 -1 effects/desktopgrid/desktopgrid.cpp https://commits.kde.org/kwin/91b538105ad312ed035fb7a0e3d798e88a2ae6f7
Git commit 408ed80604bb52870469a4f76704c224e15c02aa by Vlad Zagorodniy, on behalf of Erik Kurzinger. Committed on 26/10/2018 at 08:30. Pushed by vladz into branch 'Plasma/5.12'. [effects/desktopgrid] Specify screen projection matrix when drawing moving window Summary: Currently, when the user is moving a window in the desktop grid it is drawn from the paintScreen function to ensure it appears above all other windows. However, when drawing the window, the screenProjectionMatrix for the WindowPaintData structure is never specified. Because of this, the window will not be visible if OpenGL compositing along with Lanczos scaling are in use since its coordinates will never be projected into screen-space (unless the window is maximized, in which case the scaling code is bypassed). Related: bug 361371 FIXED-IN: 5.14.3 Test Plan: Ensure OpenGL compositing is enabled and the scaling method is set to "Accurate" on hardware supporting this option. Additionally, ensure the desktop grid effect is active and is configured to use Present Windows. Open a window and ensure is it not maximized. Click on the window and drag it around - its contents should remain visible the entire time and follow the mouse. Reviewers: #kwin, zzag, graesslin, davidedmundson Reviewed By: #kwin, zzag, davidedmundson Subscribers: broulik, davidedmundson, kwin, #kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D16430 M +1 -1 effects/desktopgrid/desktopgrid.cpp https://commits.kde.org/kwin/408ed80604bb52870469a4f76704c224e15c02aa