[konsole] [Bug 424738] New: Scrollback buffer gets partially deleted after pressing "Ctrl+L"

[ParsaMousavi]

https://bugs.kde.org/show_bug.cgi?id=424738

            Bug ID: 424738
           Summary: Scrollback buffer gets partially deleted after
                    pressing "Ctrl+L"
           Product: konsole
           Version: unspecified
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: history
          Assignee: konsole-devel at kde.org
          Reporter: sepamou at gmail.com
  Target Milestone: ---
             Flags: Usability+

Just after a recent upgrade,Konsole doesn't retain the scrollback buffer
correctly anymore and the last X lines of it(where "X" is the row size of the
terminal,24 by default) gets deleted from the buffer after pressing
"Ctrl+L".This happens in a fullscreen(by pressing "F11") terminal window
too.Also the "clear" command makes the buffer disappeared completely.

STEPS TO REPRODUCE:

1. Open the Konsole terminal emulator

2. Issue a command that generates a relatively long output(i.e more lines than
the number of terminal window rows)

3. Press "Ctrl+L" and check the scrollback buffer again



SOFTWARE/OS VERSIONS:

Linux/KDE Plasma: 5.3.0 / KDE Neon Unstable
KDE Plasma Version: 5.19.80
KDE Frameworks Version: 5.73.0
Qt Version: 5.14.2

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