[BRLTTY] brltty5.2 alpine2.11 cursor tracking

[Klaus-Peter Wegge]

Hello,

FYI: the following settings in .alpinerc (by editor or via the
configure menu of alpine) finaly solve the reported cursor tracking
problem for brltty:
  	no-enable-mail-check-cue
  	quell-imap-envelope-update
   busy-cue-rate=0

With these settings
   mail-check-interval=x
x can be set to any reasonable value e.g. 15 second for power users
or 600 seconds for slow connections. If the interval is too long, you may
loose server connection. 0 means no automatic checks for new mails.
A check for new mail can by initiated by ctrl-l at any time.

Best, Klaus

On Mon, 14 Sep 2015, Klaus-Peter Wegge wrote:

> 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