[marble] [Bug 428437] New: KML/KMZ Thumbnailer fails to create thumbs for all valid files

[Stefan Brüns]

https://bugs.kde.org/show_bug.cgi?id=428437

            Bug ID: 428437
           Summary: KML/KMZ Thumbnailer fails to create thumbs for all
                    valid files
           Product: marble
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: marble-bugs at kde.org
          Reporter: stefan.bruens at rwth-aachen.de
  Target Milestone: ---

Created attachment 132865
  --> https://bugs.kde.org/attachment.cgi?id=132865&action=edit
Example KMZ

SUMMARY
The thumbnailer does not work even for trivial, valid files marble itself has
no problems with.

STEPS TO REPRODUCE
Enable KML preview in dolphin, try preview on attached file

OBSERVED RESULT
Thumbnailer blocks for 5 seconds on the file, then returns nothing

EXPECTED RESULT
Thumbnail created

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: openSUSE TW 20201026
KDE Plasma Version: 20.08.02
KDE Frameworks Version: 5.75
Qt Version: 5.15.1

ADDITIONAL INFORMATION

The marble thumbnailer tries to geocast the returned KmlDocument to a
GeoDataDocument, which fails.

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