[Bug 578933] Need generic "deep-element-added" signal and/or playbin "element-setup" signal

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=578933

--- Comment #15 from Olivier Crête <olivier.crete at ocrete.ca> ---
playbin "element-setup" is not enough for what people have been using
FsElementAddedNotifier for, we need it also for encodebin, farstream, etc.
Basically, anything that does some kind of auto-plugging. The current
implementation is not amazing and we could do something much better inside
GstBin. Maybe have GstBin call an internal function on the parent GstBin to
emit the "deep-element-added" signal? With a helper function that hooks the
signal and calls the callback on all current elements, so it can be easily done
race-free, which is a big feature of FsElementAddedNotifier

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