[Bug 707648] Update the buffering state before stalling for more data

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=707648
  GStreamer | gstreamer (core) | unspecified

--- Comment #2 from Gustavo Noronha <gns at gnome.org> 2013-09-06 18:35:00 UTC ---
Created an attachment (id=254298)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=254298)
Test case

This is a test case I am using to test clutter-gst 3.0 buffering behaviour. It
should assert if it stops to buffer a second time, but that won't happen
without the patch, because queue2 never realizes it needs to buffer, since the
information it uses to decide is outdated.

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