Widgets that have a MouseArea of their own, for instance in a custom CompactRepresentation to open/close the plasmoid (but I have also noticed the default iconified representation to suffer from this) cannot be dragged around on the Desktop by dragging their contents. You can only move them using the applet handle or the thin border/shadow around the widget.

This can be observed with most widgets like digital clock, analog clock, fuzzy clock, battery monitor, mediacontroller. The only applets I've seen that still work is the calendar (in the heading area) and quite a few others when expanded.

I dump this here just FTR since Marco told me it's not trivial with all this event handling and propagation and needs further discussion.

Furthermore, a lot of applets just have a MouseArea because they show a custom compact representation (like the clocks) and just need a way of bringing up the popup, or because they want to do wheel events (which SNI can but default iconified plasmoids cannot).

Reproducible: Always