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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #6 from Thomas Löwe <lazyt at mailbox.org> ---
Hi Sebastian,

thanks for the review.

It's commented out because I don't know how to handle it correct (see comment
#1).

After changing the concealed flag the page should be rendered again to make the
changes visible instantly.

Maybe there is a simpler/better way for doing this, but I'm an gstreamer
noob... ;)

Thomas

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