https://bugs.kde.org/show_bug.cgi?id=496364

            Bug ID: 496364
           Summary: Metadata writing damages tiff files
    Classification: Applications
           Product: digikam
           Version: 8.5.0
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: critical
          Priority: NOR
         Component: Metadata-Engine
          Assignee: digikam-bugs-n...@kde.org
          Reporter: digb...@binkmail.com
  Target Milestone: ---

digikam silently trashes tif files when metadata is written.

Observed by
STEPS TO REPRODUCE
1. With metadata writing enabled add a face tag to a tif file produced by
photoshop which contains photoshop layer tags.

OBSERVED RESULT
The file is re-written with photoshop layers removed.   I only observed when
loading into photoshop the layers were gone. I don't know if other tags were
removed. Layer tags are often large (100MB+) which may be relevant. 

I only noticed the problem when updating a back up copy of some files and saw
some file were 100MB+ smaller.  Lucky I noticed before trashing the backups as
well. 

EXPECTED RESULT
Digikam not destroy parts of my tif files.

SOFTWARE/OS VERSIONS
Windows:  10

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