[konsole] [Bug 439831] New: Resizing the window is slow when the buffer contains a very long line

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=439831

            Bug ID: 439831
           Summary: Resizing the window is slow when the buffer contains a
                    very long line
           Product: konsole
           Version: 21.04.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: kpart
          Assignee: konsole-devel at kde.org
          Reporter: m_louis30 at yahoo.com
  Target Milestone: ---

SUMMARY

When the buffer contains a long line, resizing the terminal window takes
several seconds.

STEPS TO REPRODUCE
1. Open Konsole
2. Run the following to output a long line of text (change 10000 to something
larger if your machine is very fast):

   python3 -c 'print([x for x in range(10000)])'

3. Resize the window

OBSERVED RESULT

Resizing the window takes seconds, even when the line is hidden from view.

EXPECTED RESULT

Resizing the window is instantaneous.

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.22
KDE Plasma Version: 5.22.3
KDE Frameworks Version: 5.84.0
Qt Version: 5.15.3
Kernel Version: 5.8.0-59-generic (64-bit)
Graphics Platform: X11

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