Backport of "uridecodebin3: Ensure atomic urisourcebin state change" into 1.22
Backport of !4125 (merged) "uridecodebin3: Ensure atomic urisourcebin state change".
Commits:
- b4cadf35 uridecodebin3: Ensure atomic urisourcebin state change
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Backport of !4125 (merged) "uridecodebin3: Ensure atomic urisourcebin state change".
Commits: