[dolphin] [Bug 438674] New: Enable more default filetypes for Show Previews

[dauntless]

https://bugs.kde.org/show_bug.cgi?id=438674

            Bug ID: 438674
           Summary: Enable more default filetypes for Show Previews
           Product: dolphin
           Version: 21.04.2
          Platform: Other
                OS: Other
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: 60f31543-f82f-492a-8430-25db5521568b at dauntless.anonadd
                    y.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
Currently only a few filetypes are enabled by default when the Show Previews
option is selected, the default should be better to allow several more
filetypes. AppImage, eBooks, PDFs and Video files at least should be default
enabled when Show Preview is enabled.

STEPS TO REPRODUCE
1. Configure Dolphin > General > Previews

OBSERVED RESULT
Many filetypes are off by default which aren't on other operating systems. 

EXPECTED RESULT
Most files that have a thumbnail should show them. 

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 21.04
(available in About System)
KDE Plasma Version: 5.22.0
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

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