[Bug 755523] teletextdec: add property to show/hide hidden content

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755523

--- Comment #8 from Thomas Löwe <lazyt at mailbox.org> ---
As I remember right without the update function it was only refreshed when the
pagenumber was received again - and this can take several seconds.

So the user clicks to show hidden content and nothing happens. That's the
reason you need the page update without delay.

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