[dolphin] [Bug 457935] New: Preview does not work for some large ISO files

[MILAS Robin]

https://bugs.kde.org/show_bug.cgi?id=457935

            Bug ID: 457935
           Summary: Preview does not work for some large ISO files
           Product: dolphin
           Version: 22.04.1
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: milas.robin at live.fr
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 151348
  --> https://bugs.kde.org/attachment.cgi?id=151348&action=edit
Video where you can see that the preview work but does not show on the file

ISO File does not show any preview while on the file

STEPS TO REPRODUCE
1. Clone and install https://github.com/Hinara/dolphin-retro-thumbnail (my
thumbnailer)
2. Enable it and check that previews are enable for file of ~1.4GB
3. Try to preview a Gamecube iso file

OBSERVED RESULT
The file preview does not work but the parent folder preview of it inner file
does work

EXPECTED RESULT
That the file preview works as well as 

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.24.4
KDE Frameworks Version:  5.96.0
Qt Version: 5.15.5

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