Created attachment 110758 [details] Look at the bottom Breeze task switcher has a transparent rectangle at the bottom(see the attached screenshot). Also, it seems like tiny portion of the right border of the task switcher is not blurred. Look and Feel: Breeze Desktop theme: Breeze Dark (even though the task switcher is called Breeze, this bug is related to plasma shell, right?)
Technically this window is in kwin, but frame comes plasma stuff, so here works. We've got a similar bug reported for panels. Potentially the same cause.
... So, who sets blur region?
*** Bug 390831 has been marked as a duplicate of this bug. ***
Created attachment 111324 [details] Digital clock/calendar also has transparent parts
Notably, the gray bar is visible on the bottom even if the pop-up loads from the side of the screen (e.g. if your panel is on the side).
KWin has nothing to do with this. For example, the blur effect gets the following blur region QRegion(size=2, bounds=(0,0 216x768) - [(0,0 216x758), (206,758 10x10)]) You can clearly see that bottom part is omitted. (my screen resolution is 1366x768) Anyway, after digging a little bit, I think these issues are (maybe) caused by PlasmaCore.Dialog or dialogs/background.svgz.
Dialog's blur region is set to a mask(I don't really know what it is and how it is computed :( https://github.com/KDE/plasma-framework/blob/master/src/plasmaquick/dialog.cpp#L245 And, in my case, the mask for task switcher is QRegion(size=2, bounds=(0,0 216x768) - [(0,0 216x758), (206,758 10x10)])
I hope it'll help somehow.
If Compositor is disabled - here are possibly related Panel bugs: https://bugs.kde.org/show_bug.cgi?id=382324 https://bugs.kde.org/show_bug.cgi?id=391659 https://bugs.kde.org/show_bug.cgi?id=389215 https://bugs.kde.org/show_bug.cgi?id=381574
I fixed it. I'll push fix soon.
https://phabricator.kde.org/D13215
Git commit dce258bee3da854980b6f2430b26f7025752a505 by Vlad Zagorodniy. Committed on 06/06/2018 at 17:52. Pushed by vladz into branch 'master'. FrameSvg: Recache maskFrame if enabledBorders has been changed Summary: In some cases, when rendering frame svg background, measures & margins do not correspond to `enabledBorders`. I.e. `bottomHeight` may be equal to 5, but the bottom border is disabled. This causes visual artifacts like this {F5878318, layout=center, size=full} //Pay close attention to the bottom of the Task switcher. It has a transparent strip at the bottom, which shouldn't be there.// The cause of this problem is that FrameSVGPrivate::alphaMask doesn't take enabledBorders into account when it's making decision whether it should update maskFrame. Just for reference, this is "after" {F5878319, layout=center, size=full} Related: bug 382324, bug 391659 Test Plan: * Triggered the Breeze task switcher (with compositing on and off) * Didn't see any transparent strips --- * Tried running FrameSvgTest, still passes Reviewers: #plasma, #frameworks, mart Reviewed By: #plasma, mart Subscribers: abetts, mart, aseigo, broulik, kde-frameworks-devel Tags: #frameworks Differential Revision: https://phabricator.kde.org/D13215 M +16 -10 src/plasma/framesvg.cpp https://commits.kde.org/plasma-framework/dce258bee3da854980b6f2430b26f7025752a505