[konsole] [Bug 476051] New: Invisible splitter (black on black) when using Dark Theme

[Andrew Shark]

https://bugs.kde.org/show_bug.cgi?id=476051

            Bug ID: 476051
           Summary: Invisible splitter (black on black) when using Dark
                    Theme
    Classification: Applications
           Product: konsole
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: split-view
          Assignee: konsole-devel at kde.org
          Reporter: ashark at linuxcomp.ru
  Target Milestone: ---

In Konsole, I often want to split the tab with several views. I also use Breeze
Dark theme.

The problem is that default profile is always on dark background, while the
splitter color is the same as titlebar color. This causes it to be hardly
visible on dark theme (see screenshots).

STEPS TO REPRODUCE
1. Open the Konsole
2. Select Settings | Window Color Scheme | Breeze Dark
3. Press Ctrl + Shift + ) or View | Split View | Split View Top/Bottom.
3. Try to see where is the splitter

OBSERVED RESULT
You cannot see it clearly

EXPECTED RESULT
You should be able to see it.

Firstly, I thought that the QSplitter color should depend on the terminal
background color. But then I thought that in the same tab the profile (i.e.
background color) may be different for each split view.

So my suggestion is to use always working approach - a splitter with the color
of window theme, but surrounded with tiny line of inverted color.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.111.0
Qt Version: 5.15.11
Kernel Version: 6.5.8-arch1-1 (64-bit)
Graphics Platform: Wayland
Konsole: 23.08.2

ADDITIONAL INFORMATION
I saw some email clients do this approach for emails that do not care of users
preference. They can remove light background from image, but they keep a small
border to be on a safe side (if image is dark, its border should be visible).

By the way, Dolphin also has a split view, and it looks good with dark theme.

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