Backport of "gtk: Fail initialization of the sink if GTK4 is already initialized in the same process" into 1.24
requested to merge gstreamer-backport-bot/gstreamer:mr-6892-backport-into-1.24-gtk3-gtk4-same-process-failure into 1.24
Backport of !6892 (merged) "gtk: Fail initialization of the sink if GTK4 is already initialized in the same process".
Commits:
- cd606696 gtk: Fail initialization of the sink if GTK4 is already initialized in the same process