[konsole] [Bug 453112] New: Fixed scroll position jumps around during non-visible output

[Luke-Jr]

https://bugs.kde.org/show_bug.cgi?id=453112

            Bug ID: 453112
           Summary: Fixed scroll position jumps around during non-visible
                    output
           Product: konsole
           Version: 22.04.0
          Platform: Gentoo Packages
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: history
          Assignee: konsole-devel at kde.org
          Reporter: luke-jr+kdebugs at utopios.org
  Target Milestone: ---

SUMMARY
The scroll position is no longer fixed as it ought to be.

STEPS TO REPRODUCE
1. Set a Fixed size buffer (eg, 1000 lines as default)
2. while sleep 1; do date; done
3. Scroll up so new output isn't visible (eg, Shift-Up to go up one line)

OBSERVED RESULT
Scroll position constantly changes as there's new output beyond the visible
area

EXPECTED RESULT
Scroll position remains fixed and window contents unchanging

ADDITIONAL INFORMATION

Regression since 21.12.3 (I think)

Unlimited buffer doesn't have the problem, it appears

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