Cherry-pick opportunity for plasma-workspace to fix #1 crash

[Nate Graham]

Hello faithful distro packagers!

Those of you shipping Qt 6.9.2 may want to cherry-pick 
https://invent.kde.org/plasma/plasma-workspace/-/commit/30273fb2afcc6e304951c8895bb17d38255fed39 
into your plasma-workspace package.

This commit fixes the #1 crash in Plasma right now, which is caused by a 
regression in Qt 6.9.2 (see https://bugs.kde.org/509192 and 
https://bugreports.qt.io/browse/QTBUG-140018).

Nate