[digikam] [Bug 379918] New: Digikam writing tags in wrong order

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https://bugs.kde.org/show_bug.cgi?id=379918

            Bug ID: 379918
           Summary: Digikam writing tags in wrong order
           Product: digikam
           Version: 5.5.0
          Platform: MS Windows
                OS: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Tags
          Assignee: [hidden email]
          Reporter: [hidden email]
  Target Milestone: ---

1. Digikam is not writing tags in A-Z order.
2. Also it is not writing tags in the order as selected by user.

So what order does it use and why?
Won't option 1 or 2 not be a better idea?

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Simon <[hidden email]> changed:

           What    |Removed                     |Added
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                 CC|                            |[hidden email]

--- Comment #1 from Simon <[hidden email]> ---
I assume there is no specific order enforced by digiKam or exiv2 (library used
to write metadata). I don't directly see a reason why these should be ordered
in the first place, I think that should be up to the software displaying the
tags. And as far as I know no specification (exiv, iptc or xmp) says anything
about ordering keywords.
What is your use case for having them ordered?

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Simon <[hidden email]> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |NEEDSINFO
         Resolution|---                         |WAITINGFORINFO

--- Comment #2 from Simon <[hidden email]> ---
see above

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Sebas <[hidden email]> changed:

           What    |Removed                     |Added
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             Status|NEEDSINFO                   |RESOLVED
         Resolution|WAITINGFORINFO              |INVALID

--- Comment #3 from Sebas <[hidden email]> ---
In version 5.6.0 I can not reproduce this problem.

This is what I believe after a little digging:

The software displaying the tags (Windows Explorer) reports IPTC Keywords
first, then EXIF XPKeyworks. What I see in 5.6.0 is that existing EXIF
XPKeywords are written to IPTC Keywords when modifying tags.

For example when the EXIF XPKeyworks field contains 'A,' and the tag 'Z' is
added, then 'A; Z' is written to IPTC Keywords. Then the software displaying
the tags reads 'A; Z' from IPTC Keywords and then 'A' from EXIF XPKeyworks.
Obviously the latter is being displayed already, thus ignored.

Status changed to resolved + invalid for now.

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[hidden email] changed:

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   Version Fixed In|                            |5.6.0

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[hidden email] changed:

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                 OS|unspecified                 |MS Windows

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