[BRLTTY] Linux console hacking (was: Re: Footsteps towards better accessibility in Linux)

[Sébastien Hinderer]

Hi,

Nicolas Pitre (2026/03/28 20:41 -0400):
> The alternate screen is not cleared "at program exit". It doesn't know
> if a program exited or not.
>
> What happens here is:
>
> - When the sequence "\e[?1049h" is sent to the terminal, the alternate
>   screen is activated. It is always blank upon activation.
>
> - When "\e[?1049l" is sent to the terminal, the normal screen is
>   restored i.e. you'll end up with the same screen content that existed
>   at the moment "\e[?1049h" was sent and the alternate screen with its
>   content is discarded.
>
> You can even play with this using echo -e at the shell prompt.
> Really there isn't more to it than that.

Okay thanks for having explained the mechanism. However I continue to
observe that when an application knows how to use the alternative
screen, then right after the switch to the alternatvie screen BRLTTY
pornounces unrelated content, as if there were some leftover of a
previous session under the alternative screeen.

Seb.