[kio] [Bug 314278] New: kio_thumbnail recompute unnecessary thumbnails for *.kra and *.ora

[David REVOY]

https://bugs.kde.org/show_bug.cgi?id=314278

            Bug ID: 314278
           Summary: kio_thumbnail recompute unnecessary thumbnails for
                    *.kra and *.ora
    Classification: Unclassified
           Product: kio
           Version: unspecified
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: NOR
         Component: thumbnail
          Assignee: unassigned-bugs at kde.org
          Reporter: info at davidrevoy.com

Hi, I have the filter 'open raster' and 'calligra files' added for seing
thumbnails in my Dolphin . I'm having slow down navigating on big folders of
heavy *.ora ( open raster ) and *.kra files ( Krita native files). I'm a
digital painter. So , most of my files are of this type. 

I saw after spying system monitor activities that kio_thumbnail was having hard
time computing the thumbnails. And they appear one by one slowly. 

I was wondering ; does Kio really re-render the thumbnail one by one ? or does
it just take this time to read the embed thumbnail into the file ? ( both *.ora
and *.kra are archive , with already a thumbnails inside them rendered by the
software at saving ). I saw it way faster in Thunar or Nautilus ( with plugin
for *.ora ) , so I find it suspicious...

other infos :
for *.kra : 'preview.png' is at the root inside the archive
for *.ora : 'thumbnail.png' is inside a 'Thumbnails' folder inside the archive

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