[dolphin] [Bug 454165] New: Color theme in dolphin with alternating colors for the folder pane does not play well with Oxygen

[Jérôme Borme]

https://bugs.kde.org/show_bug.cgi?id=454165

            Bug ID: 454165
           Summary: Color theme in dolphin with alternating colors for the
                    folder pane does not play well with Oxygen
           Product: dolphin
           Version: 22.04.0
          Platform: Gentoo Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: panels: folders
          Assignee: dolphin-bugs-null at kde.org
          Reporter: jerome at escreve.me
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 149081
  --> https://bugs.kde.org/attachment.cgi?id=149081&action=edit
Commented screenshot of colors in dolphin with the oxygen color theme

Recent versions of dolphin (after correction of bug #181437) introduced
alternated colors in the folder view (left pane) similar to what already
existed in the contents views (right pane). This indeed improves readability.
However the combination of colors used do not play well with the Oxygen (clear)
color theme, resulting in a sharp contrast between successive lines, while the
alternation is generally expected to be a slight change in tone.

Using the names from KColorSchemeEditor and value for the Oxygen color scheme
(see attached screenshot):
Right panel (list of files), the colors are: "Common colors / View Background"
(white) and "View / Alternate background" (light gray #f8f7f6). 
Left panel (folders), the colors are: "Common colors / Window Background" (gray
#d6d2d0) and the newly introduce alternate is "View / Alternate background"
same as in the right panel.

While the right panel alternates between "view background" and "alternate
background" which are both light in tone, the left panel alternates between
"window background" (darker) and the same (very light) alternate as previous,
resulting in sharp contrast while alternating colors in lists should be subtle
(see last comment of Nate Graham in bug #354868).

It is not apparent with dark themes, and apparently in Breeze it also does not
create problems (because the Window background is lighter than in Oxygen).

Without changing the functionality, it would be nice if the alternating color
of the left panel would be selected to another item among the the color theme.
This change would be likely make no visual difference to users of darker themes
where all items are dark. It does make a lot of difference to Oxygen users
because the view color is white while the window background is quite a bit
darker.

You might ask why do I not change the window background. I think the problem is
not from Oxygen, which is a beautiful color theme that works well in all
applications. I think this issue here results from the choice of items in the
palette specifically for this feature in dolphin, and the problem is only
exposed when using the Oxygen color theme.

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