[Bug 751157] basetextoverlay: Pass down GstVideoOverlayComposition buffers from upstream, receive window size event

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751157

--- Comment #7 from Lubosz Sarnecki <lubosz at gmail.com> ---
Created attachment 306507
  --> https://bugzilla.gnome.org/attachment.cgi?id=306507&action=edit
basetextoverlay: Send caps event to receive current allocation query

To make the textoverlay receive a current window resolution from the sink,
a send caps event needs to be sent, to not receive a cached allocation query.

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