[plasmashell] [Bug 483163] blank screen on lock screen activation when using breeze plasma style

[Nicole Schoebel]

https://bugs.kde.org/show_bug.cgi?id=483163

--- Comment #25 from Nicole Schoebel <schoebel220630 at nschoebel.de> ---
Earlier today I went into "System Settings / Display & Monitor" and DISabled
"Compositing / Enable on startup". I then rebooted. After I logged back into
KDE, I could then activate the lock screen and it would show properly. I tested
this multiple times, and it worked fine every time.

I then re-enabled the compositor, and then the lock screen would show up black
again except for the mouse cursor.

So the bug only seems to appear when the compositor is enabled, which makes me
wonder if the compositor is getting confused about which window should be
displayed on top? If I understand the design of the lock screen correctly (as
described in the sources in kscreenlocker/DESIGN), then a fullscreen (empty -
all black) window is put on top of all other windows, and then the actual lock
screen is put on top of that. If the compositor for some reason would think
that that fullscreen window belongs on top of the lock screen... we would see
exactly this bug. So, could this actually be a compositor bug?

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