The cases where I can reproduce that bug don't seem to be affected by the patch. The first case is connecting the same monitor with both VGA and DVI cables and swapping the outputs relative position along with swapping the primary output at the same time, and the second one involves placing the task manager widget on the desktop and disconnecting and reconnecting the primary monitor. I also experience completely disappearing taskbar buttons in certain cases, this also doesn't seem to be affected. As a side note, all those glitches get reverted when I enter panel customization or taskbar settings, and what looks like the cause is QQmlEngine::retranslate() getting called which updates all the QML bindings as a side effect.

Yes, I don't have an account, so I'll need someone to land it, thanks.

Added indentation. The block is suggested by the Qt Documentation. Without it, a warning will be thrown:

QSqlDatabasePrivate::removeDatabase: connection 'kactivities_db_resources_94156823977952' is still in use, all queries will cease to work.