[Bug 770357] list of elements exposed depends on available display at first init

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770357

--- Comment #1 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 334601
  --> https://bugzilla.gnome.org/attachment.cgi?id=334601&action=edit
vaapi: DISPLAY envvar as dependency

In a multiple video cards system, a X11 environment may have different VA
capabilities. This patch tracks the DISPLAY environment variable to
invalidates the GStreamer features cache. Also tracks WAYLAND_DISPLAY.

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