Backport of "qmlglsink: Keep old buffers around a bit longer if they were bound by QML" into 1.18
requested to merge tpm/gst-plugins-good:backport-mr-810-into-1.18-qmlglsink-keep-textures-around into 1.18
Backport of !810 (merged) "qmlglsink: Keep old buffers around a bit longer if they were bound by QML".
Commits:
- e3c16d01 qmlglsink: Keep old buffers around a bit longer if they were bound by QML