Created attachment 126284 [details] Suggestion Image SUMMARY So I noticed when my windows were minimized the thumbnails of the windows were changed to reflect their icons rather than the content of the windows, however with highlighted windows the minimized window shows its entire context despite the thumbnail being changed to the app icon. SUGGESTION Add a sub-option to the highlighted windows option to hide window content when minimized, so the preview shows the placement and size of the minimized window without showing its contents. Examples are posted in the attachment. SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE neon 5.18.1 (Kernel Version: 5.3.0-40-generic) KDE Plasma Version: 5.18.1 KDE Frameworks Version: 5.67.0 Qt Version: 5.14.1
This is a KWin limitation. You can force it on (with potentially visual and performance consequences) in System Settings > Display & Monitor > Compositor > Keep Window Thumbnails > Always
There is still a bug in the Task Manager because whoever implemented this assumed that minimized windows cannot have thumbnails and so Task Manager never shows them when minimized even if "always shown" is used.
Just to be clear I do like that the thumbnails aren't visible when windows are minimized, I consider this to be a non-intended privacy feature. I'd like to extend that privacy "feature" to the Window highlight option, since when the application is minimized even though the thumbnail on the task manager is hidden, the context of the window highlight is still shown. A somewhat of a solution I've heard is to do this System Settings > Display & Monitor > Compositor > Keep Window Thumbnails > Never but in this case it hides the window dimensions and position. I'd like to keep that part of the window shown, but the context of the window hidden when minimized, just like in the suggested image that was attached.
I believe the compositing option "only for Shown Windows" is sort of what I'm going for, but it doesn't work.
(In reply to Kai Uwe Broulik from comment #2) > whoever implemented this assumed that minimized windows cannot have thumbnails That person didn't assume anything but rather were forced to implement WindowThumbnail the way it is now because unmapped windows have no pixmaps.
No. The code in task manager has checks for "is window minimized" and then doesn't even bother showing the WindowThumbnail, even if it could in theory have a preview when KWin was configured accordingly.