[dolphin] [Bug 426837] New: Text file previews showing up blank depending on file extension

[ocalhoun]

https://bugs.kde.org/show_bug.cgi?id=426837

            Bug ID: 426837
           Summary: Text file previews showing up blank depending on file
                    extension
           Product: dolphin
           Version: 19.12.3
          Platform: Kubuntu 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: ---

Created attachment 131845
  --> https://bugs.kde.org/attachment.cgi?id=131845&action=edit
Screenshot of text file previews

SUMMARY
I have previews for text files enabled, and when I first installed the system,
they did work perfectly. After a few days of running, though, *some* text files
are now showing blank preview images. (See attached screenshot.) It seems to
depend on the file extension. If the file ends in .txt or has no extension at
all, the preview is blank. But other text file extensions such as .cfg, .dat,
and .ini are working perfectly.

See the attached screenshot -- in this screenshot, all five text files are
exactly identical copies of each other and differ only in the filename. Three
show perfect preview images, but two show blank previews. (All other file type
previews are working perfectly.)

When text files are placed on the desktop, it shows the icon for a text file
and doesn't attempt to preview them -- don't know if that's relevant or not.

This seems similar to bug #113572 https://bugs.kde.org/show_bug.cgi?id=113572
but I thought I'd put it up as a new bug since that one is 15 years old and has
been marked as not reproducible.

Using Kubuntu 20.04

Tried several cold reboots; problem persists.
Tried disabling text file previews and re-enabling it; problem persists.

STEPS TO REPRODUCE
1. create several identical text files, one with no file extension, and one
each with .txt, .cfg, .ini, .dat
2. enable text file previews and view the folder these text files are in
3. (hopefully) observe that the text file with the blank extension and the one
with the .txt extension show blank preview images, while the other three show
correct preview images

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 20.04
(available in About System)
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8

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