[konsole] [Bug 484836] New: Background color of whitespace characters changed by scrolling

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=484836

            Bug ID: 484836
           Summary: Background color of whitespace characters changed by
                    scrolling
    Classification: Applications
           Product: konsole
           Version: unspecified
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: emulation
          Assignee: konsole-devel at kde.org
          Reporter: mpeter.68m0y at simplelogin.co
  Target Milestone: ---

Created attachment 167999
  --> https://bugs.kde.org/attachment.cgi?id=167999&action=edit
steps to reproduce in images

Konsole version: 24.04.70
Source: gitlab CI release with name
'konsole-master-2985-windows-cl-msvc2022-x86_64'

SUMMARY
If I scroll a larger amount (like with Page Up/Down, or in vim with with '50
Ctrl+e'), the background color of multiple lines will be applied a specific
color.
The same happens if I scroll up after scrolling down, but sometimes it is also
happening if I just scroll down one line at a time.

So far I have only noticed this in vim, independently of whether it syntax
colors the file or not.

STEPS TO REPRODUCE
1. Find a file which is large enough that you can scroll it (example file
below)
2. Open this file in vim
a)
3. Scroll more than 1 line at once
b)
3. scroll down by pressing the down arrow on the keyboard
4. scroll back with the up arrow

I have also included an image with screenshots to help understand what is
happening.

The following is a file with which I can reproduce the problem, but any file
should do:
https://invent.kde.org/utilities/konsole/-/blob/ac11bc83b450196eb942e7b377b506fe332b7696/src/Application.cpp

OBSERVED RESULT
The background color of lines have changed

EXPECTED RESULT
The background colors stay unchanged

SOFTWARE/OS VERSIONS
Windows: 10
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION
It appears that it does not matter whether vim uses colored text in the file or
not, the background color of blanks will change on scrolling regardless of
that.

The `less` command with the same file does not reproduce this problem.

While experiencing the problem in vim, I have found 2 ways that temporarly fix
the background colors of lines in the current view:
- resizing the terminal pane, or the whole window if the tab only has 1 pane
- using the "Visual Line" selection mode, if I go over with my cursor all the
affected lines twice (by moving the cursor so that the lines are selected and
then not anymore), it fixes up their background color. Some lines are fixed up
the first time they are reached, but some only partly.

It seems the incorrect background color of blanks is always the normal variant
of the "Color 3" color of the current color scheme. Changing the color scheme
changes the blanks' color to the appropriate color of the new color scheme.

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