[Bug 752213] tee: Avoid race condition while forwarding sticky events

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752213

--- Comment #25 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 324924
  --> https://bugzilla.gnome.org/attachment.cgi?id=324924&action=edit
tee: Prevent race condition between adding pads and forwarding sticky events

Between copying all sticky events to the new pad and adding it to the element,
a new sticky event might arrive that would then never be forwarded to the new
pad. To be forwarded automatically it would have to be added to the element
already.

Instead just remember when we have to recheck sending sticky events and do so
in the chain function if needed.

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