[digikam] [Bug 523914] New: Face tag assignment sometimes resolves to a non-face tag with the same leaf name

https://bugs.kde.org/show_bug.cgi?id=523914

            Bug ID: 523914
           Summary: Face tag assignment sometimes resolves to a non-face
                    tag with the same leaf name
    Classification: Applications
           Product: digikam
      Version First 9.1.0
       Reported In:
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Faces-Workflow
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

DESCRIPTION
I have two different tags with the same leaf name but located in different
branches of the tag hierarchy, for example:

- "Photographer/John Smith" (a regular tag)
- "Subject/John Smith" (a face tag)

When assigning the face tag to a large number of detected faces (using the
People tab), DigiKam initially assigns the correct face tag (Subject/John
Smith). However, after a number of images, it unexpectedly starts assigning the
regular tag (Photographer/John Smith) instead.

STEPS TO REPRODUCE
1. Create a tag "Subject/John Smith", mark it as a face tag
2. Create a tag "Photographer/John Smith"
3. Detect faces in many images (20+)
4. In the People tab, select all the detected faces and assign "Subject/John
Smith"

OBSERVED RESULT
After several successful assignments with "Subject/John Smith", DigiKam starts
assigning
"Photographer/John Smith" instead. From that point on, all subsequent
assignments in the same batch will receive the wrong face assignation.


EXPECTED RESULT
All selected faces should receive the "Subject/John Smith" tag

SOFTWARE/OS VERSIONS
Operating System (available in the Info Center app, or by running `kinfo` in a
terminal window): Arch Linux
KDE Plasma Version: 6.7
KDE Frameworks Version: 6.28
Qt Version: 6.11.1

ADDITIONAL INFORMATION
- The tag name autocompletion UI only shows the face tags (as expected)
- Reassigning wrongly tagged faces with the right tag, deleting the "face tag"
status to "Photographer/John Smith" won't prevent the problem from occurring
again at next face tag batch assignation
- So far, I have never encountered the bug when assigning face tags to a single
image
- Metadata in MySQL and embedded in JPEG files.

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