[BRLTTY] brltty5.2 alpine2.11 cursor tracking

[Klaus-Peter Wegge]

Thanks for both answers and explanations.
The problem does not appear with alpine2.11 on the debian8 when
downgrading to a brltty4.x version. May be it has to do with the change
of the refresh strategy from 4 to 5.
BTW: older alpine versions have the same problem with brltty5.

I figured out that brltty feels that something changed on the
screen when alpine checks for new mails every x seconds. Even if there is
no change on the screen (no new mail, no message) brltty brings the
braille window back to the cursor position.
A work around is to set mail-check-interval=150 (from 15 to 150
seconds) in .pinerc or via alpine's setup / configuration menu.
This long interval is not satisfying but is a possible option.
It would be preferable if brltty can identify a not changed screen 
after an event by one polling in 1/25 second (as in the old version).
Such a "confirm" poll seems acceptable due to the usual reaction time of
braille displays and this behavior may be switch on/off by
configuration (or application specific).

Best, Klaus

On Mon, 14 Sep 2015, Samuel Thibault wrote:

> Hello,
>
> Klaus-Peter Wegge, le Mon 14 Sep 2015 09:12:02 +0200, a écrit :
>> with my update to debian 8 I also updated from brltty3.8 to 5.2.
>> Now I'm approaching the following problem when using alpine2.11:
>
>> This effect does not appear when login in by ssh from an old PC with
>> brtlly 4.x.
>> The described behavior appears only in alpine.
>
> Please also check with the same version of alpine, e.g. by downgrading
> alpine on your debian 8 system. Perhaps they introduced something in
> alpine 2.11 which breaks cursor tracking.
>
> Samuel