- My TV (TV & timeshifting on)
- Teletext GUI
- press b to stop playing

-> TV is turned off, small preview window turns black and gets useless

- press ESC to return to My TV GUI

-> TV is playing again

- Teletext Fullscreen
- press b to stop playing

-> TV is NOT turned off

Suggestions (I think both would make sense):

Alternative 1:
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Change the behaviour when TTX is running, so that TV can't be turned off by pressing "b".

Alternative 2:
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As you can always turn off TV by pressing "b" when timeshifting is enabled, it might also be a good idea to
- remove the preview window as soon as TV is turned off
- change the behaviour, so that TV stays off when switched back to TV Home from TTX GUI
- enable TV turn off by "b" in TTX fullscreen