[Bug 755249] gtkglsink: Hide and cleaned the GtkWindow we might create

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755249

--- Comment #2 from Thibault Saunier <tsaunier at gnome.org> ---
Created attachment 311667
  --> https://bugzilla.gnome.org/attachment.cgi?id=311667&action=edit
gtkglsink: Hide and clean the GtkWindow we might create

When stopping the sink we should always hide the window.

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