[BRLTTY] brltty5.2 alpine2.11 cursor tracking

[Nicolas Pitre]

On Mon, 14 Sep 2015, Nicolas Pitre wrote:

> On Mon, 14 Sep 2015, Dave Mielke wrote:
> 
> > [quoted lines by Nicolas Pitre on 2015/09/14 at 18:11 -0400]
> > 
> > >I really do enjoy the current display refresh snappiness and 
> > >I'd like for my refresh delay to remain at 0.
> > 
> > Could you give the latest code (with a 5ms delay) a (fair) test? I don't think 
> > that this rather short delay is noticeable.
> 
> Agreed.

Well... It's been a few days since I've been running that brltty version 
on my BC640.  I don't know how the 5ms delay might affect things other 
than the screen refresh rate, but it seems that some braille display key 
events are dropped. Of course this is more visible with key release 
events that show as stuck keys.  It seems to occur only with combination 
of multiple keys so far, especially those that moves the display across 
multiple lines such as NXDIFCHAR or NXDIFLINE.  Maybe in that case, 
since there are more such key events to process simultaneously and more 
work is performed to move the window, something might be lost due to a 
race or something.

It usually took many hours between occurrences of this problem, 
therefore this is very hard to reproduce reliably.

I've been using my previous brltty version for a couple hours now and 
this issue appears to be gone.  I don't remember experiencing this 
before I tested the latest brltty either.


Nicolas