6454698f82
`parsebin` is potentially added by a `typefind` callback. That `typefind` was activated by a `READY_TO_PAUSED` state change on `urisourcebin` We want to ensure that it is the "setup_parsebin_for_slot" method that activates the underlying `parsebin`, and not the external state-change. Otherwise we would risk a potential deadlock where elements activating in `parsebin`, and which would cause the upstream `typefind` to switch scheduling mode, would not be able to acquire the STREAM_LOCK of the `typefind` task. Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/4225 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8511>