Teletext improvements

Hi together,

I'm working on a teletext improvement (most likely on Monday you get more informations ).

But I have a little problem:

In lib/components/tuxtxtapp.cpp I see this:

int eTuxtxtApp::startUi()
{
	if (fbClass::getInstance()->lock() >= 0)
	{
  ...

So I guess that the "e2" framebuffer should be locked and the teletext should get exclusive access to the framebuffer (the same for the LCD and the remote). So only the teletext should be displayed in the OSD nothing else.

But the teletext don't get exclusive access to framebuffer. E.g. for subtitles Littlesat has build a workaround in the plugin to hide the subtitles (http://sourceforge.net/p/openpli/tuxtxt/ci/master/tree/tuxtxt/plugin/plugin.py):

...
self.subtitle = infobar and infobar.selected_subtitle
if self.subtitle:
   infobar.enableSubtitle(None) 
...

Am I wrong with the exclusive access? Or is it a bug?