[Bug 774149] nlecomposition: De-duplicate seek events based on their sequence number

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774149

--- Comment #4 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 339482
  --> https://bugzilla.gnome.org/attachment.cgi?id=339482&action=edit
nlecomposition: Fix small remaining race in previous commit

The seek action might currently be handled (in which case it is not in
the actions list and the action lock is not locked), but not actually
handled completely yet (the seqnum is not stored yet).

To prevent this, we remember what the current action is that is being
handled, and also compare to that.

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