Remove usage of QWeakPointer for QObject for thumbnails
Summary: This usage of QWeakPointer has been deprecated since Qt 5.0, since it leads to really confusing API - usually you must never dereference a QWeakPointer directly, but always go through QSharedPointer, except in this one case, where it's permissible. The thumbnails are only referenced in one place, this change is straight-forward. Reviewers: #kwin, romangg Reviewed By: #kwin, romangg Subscribers: romangg, kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D23070
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ef670c36
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