[konsole] [Bug 442330] New: Terminal output shifts one line up/down on window minimize/maximize

[Michael Konieczny]

https://bugs.kde.org/show_bug.cgi?id=442330

            Bug ID: 442330
           Summary: Terminal output shifts one line up/down on window
                    minimize/maximize
           Product: konsole
           Version: 21.08.1
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: kde at bh.m5k8.net
  Target Milestone: ---

Created attachment 141483
  --> https://bugs.kde.org/attachment.cgi?id=141483&action=edit
Recorded behavior

SUMMARY

After sequence of terminal window minimization/maximization, there's a glitch
causing terminal output content to temporarily move one line down/up.

When switching to other app window and back to konsole, window content stays
intact.

This movement of line down/up happens only when terminal is scrolled to he
bottom (last line and prompt is visible). When we scroll the content somewhere
up, behavior is slightly different: bottom line temporarily shows proper line
that should be here, but after a moment it's erased with empty line.

Screen recording is attached.

STEPS TO REPRODUCE
1. Fill the terminal window with some content that fills it vertically and is
scrollable verically
2. Try to minimize/maximize konsole window in various vertical scroll
positions.

OBSERVED RESULT

As described, see attachment that contains recorded behavior as video.

EXPECTED RESULT

Steady window content.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
(available in About System)
KDE Plasma Version: 5.22.5-1
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

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