[konsole] [Bug 427918] New: Scrolling is broken when scrollbar is hidden

[Ismael Asensio]

https://bugs.kde.org/show_bug.cgi?id=427918

            Bug ID: 427918
           Summary: Scrolling is broken when scrollbar is hidden
           Product: konsole
           Version: master
          Platform: Compiled Sources
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: isma.af at gmail.com
  Target Milestone: ---

Created attachment 132523
  --> https://bugs.kde.org/attachment.cgi?id=132523&action=edit
Scrolling attemp

SUMMARY

Konsole fails to update the most part of the terminal contents when scrolling
with mouse wheel or touchpanel. This only happens when the scrollbar is hidden. 

In the attatchment you'll see the central part of the terminal stays fixed
despite being scrolling (scrolling can be seen on the first two characters of
each line). It repaints again if the window is resized.

I could git bisect this to MR
https://invent.kde.org/utilities/konsole/-/merge_requests/236.

STEPS TO REPRODUCE
1. Set "Scrollbar position" to "Hidden"
2. Print something larger than the window height.
3. Scroll using mouse wheel or touchpad

OBSERVED RESULT
The terminal does not redraw the scrolled contents to its new position.

EXPECTED RESULT
Content is correctly displayed when scrolled.

SOFTWARE/OS VERSIONS
Konsole Version: 20.11.70 (master)
KDE Plasma Version: 5.20.90 (master)
KDE Frameworks Version: 5.76.0 (master)
Qt Version: 5.15.2

ADDITIONAL INFORMATION

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