Bug#975687: xterm: loses text lines, even descenders from some lines

[Thorsten Glaser <tg@mirbsd.de>]

Thomas Dickey dixit:

>I see that version in testing, but don't see a problem on the screen.
>I made a short script to cat those lines to the terminal, sleeping 0.2
>seconds between bursts, and the result looks ok, even with a magnifier.

Indeed, tricky. I experimented with this a bit.

I can reproduce this if I change your script from while true
to for x in 1 2 3 (so it does that only three times) but, and
this is important, move the xterm so that its bottom is below
the bottom end of the X11 screen.

If I move the syslog terminal up by a few pixels, the problem
does not happen.

If I use other terminal, font, etc. sizes, I also get display
corruption effects which vary (see screenshot).

If I switch virtual workspaces (Ctrl-Alt-[1-8←→] in evilwm)
the effects go away as well.

Maybe you can reproduce it with this info?

Thanks,
//mirabilos
-- 
15:39⎜«mika:#grml» mira|AO: "mit XFree86® wär’ das nicht passiert" - muhaha
15:48⎜<thkoehler:#grml> also warum machen die xorg Jungs eigentlich alles
kaputt? :)    15:49⎜<novoid:#grml> thkoehler: weil sie als Kinder nie den
gebauten Turm selber umschmeissen durften?	-- ~/.Xmodmap wonders…