Avoids ungrouping while GroupManager is destroyed and unnecessary
work in connected visualizations, and in practice a crash in Task
Manager from the ungroup model transaction hitting a half-destroyed
applet.
BUG:334772
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Branched from the monolithic repo kde-workspace, frameworks branch, at commit
049113e719dd2fc4446d054fa1a3aada330094f0
Eike Hein
Aleix Pol