[Bug 666379] adder: fixes to the GstCollectPads2 port - test now passes

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=666379
  GStreamer | gst-plugins-base | unspecified

--- Comment #1 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2011-12-16 17:39:18 UTC ---
Created an attachment (id=203689)
 View: https://bugzilla.gnome.org/attachment.cgi?id=203689
 Review: https://bugzilla.gnome.org/review?bug=666379&attachment=203689

adder: send a flush event before trying to get the stream lock

This avoids hanging when the streaming thread is busy in _chain
waiting for preroll.

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