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qt: clear qml type registrations within `MainUI` destruction

Fatih Uzunoğlu requested to merge fuzun/vlc:qt/missingclearqmlregistrations into master

QML types need to be cleared for two reasons:

  • Protected modules do not allow new type registrations.
  • It does not make sense to re-register same types.

This is currently the case if a compositor fails when initializing the quick view.

Note that qmlClearTypeRegistrations() is effective on protected modules as well.

It is a known bug from Qt's side that once Qt Quick view (engine) is fully initialized, re-initialization is flaky and causes crashes. See QTBUG-113274. Unfortunately this does not fix that issue.

Request review @chub.

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