From the docs:
This is dangerous, because when an event loop is entered in a signal
handler or binding, the QML engine continues to run other bindings,
animations, transitions, etc. Those bindings can then cause side effects
which, for example, destroy the hierarchy containing your event loop.
BUG: 347997
REVIEW: 125545
* Not just apps, also documents and contacts can now be added
to the favorites. All types of content have their full context
menu action list available also in the favorites sidebar.
* Contact favorites use the contact photo as icon, with a circular
alpha mask and the presence status icon as overlay badge.
* Adding/removing favorites from context menus now works every-
where, e.g. also in KRunner-based search results.
* Far fewer actions now cause a full rebuild of the model tree
and instead only delta updates, as a side-effect of adding a
mechanism for this to e.g. handle status changes for contact
items.
* Various bugs around hiding/unhiding apps got fixed.
* Lots of code cleanup + less coupling all around.
Kai Uwe Broulik
Eike Hein
David Edmundson