[konsole] [Bug 389746] Output is garbled when many lines are printed at once

[Egmont Koblinger]

https://bugs.kde.org/show_bug.cgi?id=389746

--- Comment #11 from Egmont Koblinger <egmont at gmail.com> ---
Timing doesn't matter in konsole, slowcat'ing this file by inserting a 50ms
pause between each byte (after compiling VTE: vte/src/slowcat -t 50000
typescript) produces the same output.

If timing makes a difference at all, as seen originally, it might be because
tmux receives its stuff at different times and hence updates in different ways,
all of which _should_ result in the same final look.

What triggers the problem in konsole is at byte offset 2810 of typescript.

To reproduce manually: Produce at least a screen of data, then execute:

echo -e "\e[1;23r\e[23S"

It sets up the scrolling region to rows 1-23 (that is, the bottom row, row 24
excluded) and asks to scroll by 23 lines. This should effectively clear those
lines (and leave the bottom row intact), but it konsole it doesn't do anything.

I vaguely recall already having seen a bug report for this in konsole (it's
buggy when the parameter to S [the number of lines to scroll by] is
greater-than-or-equal-to the height of the scrolling area), but cannot find it
now.

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