[dolphin] [Bug 446222] New: Default font color for text file thumbnails is "View Text" but this can be set as white by system theme and the white background of the thumbnail never changes.

[ocalhoun]

https://bugs.kde.org/show_bug.cgi?id=446222

            Bug ID: 446222
           Summary: Default font color for text file thumbnails is "View
                    Text" but this can be set as white by system theme and
                    the white background of the thumbnail never changes.
           Product: dolphin
           Version: 19.12.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: view-engine: icons mode
          Assignee: dolphin-bugs-null at kde.org
          Reporter: 7485697 at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
Default font color for text file thumbnails is "View Text" but this can be set
as white by KDE system theme and the white background of the thumbnail never
changes. This is especially likely to happen when using dark/night color
schemes. (Previews still load properly for any file that's interpreted as code,
such as .py because the context highlighting overrides the font color and makes
it readable.)

Solution A) hard-code the font color on text file thumbnails so that it can't
be changed by the system theme. This makes sense because the background color
can't be changed either.

Solution B) allow changing the background color of text file thumbnails through
the system color scheme, and set it to a color that usually contrasts with the
"View Text" color.


STEPS TO REPRODUCE
1. In the KDE system settings, change the color scheme so that the "View Text"
color is white (or just switch the overall system theme to the pre-installed
'Breeze Dark').
2. In Dolphin, enable text file thumbnails.
3. In Dolphin, open a folder that contains plain text files (.txt or no file
extension) that have text in them. 

OBSERVED RESULT
Text file thumbnails show up as 'blank', despite the actual files having text
in them. On very close inspection, you might notice that the text is actually
there, but colored white against the white background. But it's barely visible
and entirely unreadable.

EXPECTED RESULT
Text file thumbnails have black (or other dark color) text against the white
background.


SOFTWARE/OS VERSIONS
Linux: Ubuntu 20.04 (with KDE installed on top)
KDE Plasma Version: 5.18.5
KDE Frameworks Version:  5.68.0
Qt Version: 5.12.8

ADDITIONAL INFORMATION
If somebody can point me to where in the code these colors are determined, I'd
be happy to try and change it myself.
Anyway, even if this bug is fixed, it will probably be a long time before the
newly updated Dolphin version makes it onto the LTS versions of Ubuntu, so I'd
very much appreciate the opportunity to fix it on my own PC, even if it means I
have to compile my own fork of Dolphin to do so.
(Hopefully, the thumbnails are actually generated by another package, so I
could have my own fork or updated version of just that package. That would be
ideal.)

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