[Bug 666247] teletextdec: add cache navigation functions

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=666247

--- Comment #16 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
It is what is used for DVD menus for example, and most video sinks will e.g.
send navigation events on mouse move/click, cursor keys, etc.

Basically you would handle the navigation events in the element, and could map
e.g. GST_NAVIGATION_COMMAND_LEFT

See
https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstnavigation.html

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