https://bugs.kde.org/show_bug.cgi?id=449233

            Bug ID: 449233
           Summary: Only one line is saved when multiple lines are
                    scrolled up
           Product: konsole
           Version: 21.08.3
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: history
          Assignee: konsole-de...@kde.org
          Reporter: ma...@svgalib.org
  Target Milestone: ---

SUMMARY
When scrolling up multiple lines (currently only done by an escape sequence)
only one line is saved to the history buffer, the rest are lost.

STEPS TO REPRODUCE
1. Run in konsole:
 seq 1 100
 echo -e "\e[20S"
2. Scroll back half a page

OBSERVED RESULT
19 lines are missing (for a terminal of 40 lines, the numbers jump from 63  to
83).

EXPECTED RESULT
All lines are displayed.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 34 
(available in About System)
KDE Plasma Version:  5.22.5
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2

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