[Bug 722767] element: add function to sync element state with target state of the parent

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=722767
  GStreamer | gstreamer (core) | 1.x

--- Comment #4 from Miguel París Díaz <mparisdiaz at gmail.com> 2014-02-10 11:08:31 UTC ---
Created an attachment (id=268655)
 View: https://bugzilla.gnome.org/attachment.cgi?id=268655
 Review: https://bugzilla.gnome.org/review?bug=722767&attachment=268655

Sync state of a children with its parent target state.

I have been thinking that a better solution is change the connotation of
gst_element_sync_state_with_parent to avoid the users have concurrence
problems.
I think that the users want use this function to sync the state of a element
with the target state of its parent, not the current or the pending one,
because these are variable.

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