https://bugs.kde.org/show_bug.cgi?id=451429
Bug ID: 451429
Summary: Fixed size scrollback overflowing moves scrolled up
text
Product: konsole
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: history
Assignee: konsole-de...@kde.org
Reporter: j...@keelhaul.me.uk
Target Milestone: ---
SUMMARY
Normally, when the terminal is scrolled backwards to view previous output, the
view should then remain stationary regardless of what is being printed by the
shell process. However, if the fixed size (lines) of scrollback is exceeded,
the discarding of outdated scrollback somehow seems to shift the displayed text
in the view. This is very disconcerting when scrolling back to view, e.g.
previous compilation output, while more is being generated.
The effect is difficult to describe, but hopefully the following test cases
will reproduce it.
STEPS TO REPRODUCE
1. Start a new Konsole window with a specified fixed scrollback size - here
set to 10,000 lines.
2. Run a command which prints periodic output to the terminal:
$ perl -e 'for (1..1000) { print $_,"\n"; sleep 1; }'
3. Let the command run to fill a full page and start scrolling up, then scroll
backwards using the scroll bar or mouse wheel. Just a few lines will do.
4. Observe that the scrolled back output remains stationary, although the
scroll bar shrinks as more output is produced.
5. Interrupt the previous command, then output enough lines to fill and
overflow the scrollback history:
$ perl -e 'for (1..20000) { print $_,"\n"; }'
6. Start the periodic output again:
$ perl -e 'for (1..1000) { print $_,"\n"; sleep 1; }'
7. Scroll backwards again. This time the scrolled back output will jump
upwards by 5 lines every 5 seconds, for as long as more output is produced.
The scroll bar remains stationary.
OBSERVED RESULT
In step 7, scrolled back output moves as more output is produced.
EXPECTED RESULT
The scrolled back output should remain stationary.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 5.24.80
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
Konsole version: Git master (56abf298)
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