[konsole] [Bug 417469] New: Konsole scroll bar is difficult to see with a black background

[Paul Marks]

https://bugs.kde.org/show_bug.cgi?id=417469

            Bug ID: 417469
           Summary: Konsole scroll bar is difficult to see with a black
                    background
           Product: konsole
           Version: 19.08.1
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: paul at pmarks.net
  Target Milestone: ---

STEPS TO REPRODUCE

1. Launch Konsole
2. Set the color scheme to "Linux Colors", or anything with a black background
3. Do anything that requires scrolling

OBSERVED RESULT

The scroll bar is rendered as dark grey on black (see attached screenshot.)  I
have at least average vision, and I have to hold my face up to the screen and
squint to determine the scroll position.

EXPECTED RESULT

The scroll bar should have reasonable contrast, and there should be an option
to revert to the system-wide theme.

SOFTWARE/OS VERSIONS

I'm currently using Konsole 19.08.1 with LxQt 0.14.1 on Debian testing.  The
problem also occurs on my work computer with Cinnamon.

ADDITIONAL INFORMATION

This started a few years ago, when Konsole (unnecessarily, imho) switched to a
custom scrollbar.  I've been using the blue "Solarized" theme to work around
the problem, but I prefer black.

This was reported twice on the forums:
- https://forum.kde.org/viewtopic.php?f=227&t=142814
- https://forum.kde.org/viewtopic.php?f=227&t=156174

The latter speculates that https://phabricator.kde.org/D11184 is the cause.

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