https://bugs.kde.org/show_bug.cgi?id=364280
--- Comment #3 from Pierre Ducroquet ---
I don't have enough time to build and test Plasma 5.7 right now, I'll wait for
the Debian sid packages or try to fix up a test machine with a second screen.
Sorry for the wrong category, I though it was kwin that
https://bugs.kde.org/show_bug.cgi?id=364280
Bug ID: 364280
Summary: If a window has its content moved below the screen
(but not its whole decoration), it disappears from
taskbar
Product: kwin
Version: 5.6.4