- causing too many regressions along the way
- most of our popups are already destroyed properly inside Popups.qml
- in general, a Popup (Dialog, Menu, etc.) can be manually destroyed iff
it had been created using `Component.createObject()`, otherwise it's gone
for good until restart
- manually enabled the destroy-on-close in verified cases
Fixes#10948 (maybe some other dupes)
Lukáš Tinkl
Patryk Osmaczko
Igor Sirotin
Richard Ramos
Alexandra Betouni
Jonathan Rainville