[Bug 767053] nlecomposition: Fix race condition in seek handling causing deadlocks

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767053

--- Comment #1 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 328784
  --> https://bugzilla.gnome.org/attachment.cgi?id=328784&action=edit
nlecomposition: Fix race condition in seek handling causing deadlocks

We might receive another seek from the application while the action task is
handling a previous seek (and thus setting seeking_itself to TRUE). To prevent
this seek to go through directly instead of being added as an action, also
check if the seek event was received from our action task thread or some other
thread.

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