Backport of selected bugfixes from the 1.18.6 release to fix the "Flicker" problem#2

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fredowski wants to merge 6 commits intomavlink:qgroundcontrolfrom fredowski:flickfix

+108-9

Commits on Sep 15, 2022

qtitem: fix leak of caps

ystreet
authored and
fredowski
committed
qmlglsink: propagate the context up the the application

ystreet
authored and
fredowski
committed
qt: don't always activate/deactivate our GstGLContext

ystreet
authored and
fredowski
committed
qmlglsink: fix crash when created/destroyed in quick succession

breboulet
authored and
fredowski
committed
qtitem: don't potentially leak a large number of buffers

ystreet
authored and
fredowski
committed
qmlglsink: Keep old buffers around a bit longer if they were bound by QML

sdroege
authored and
fredowski
committed