[digikam] [Bug 368734] New: Moving a hierarchy of tags (a tag with subtags) doesn't work and can lead to losing the complete hierarchy

[Marcus Christopher via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=368734

            Bug ID: 368734
           Summary: Moving a hierarchy of tags (a tag with subtags)
                    doesn't work and can lead to losing the complete
                    hierarchy
           Product: digikam
           Version: 5.1.0
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: critical
          Priority: NOR
         Component: Tags
          Assignee: digikam-devel at kde.org
          Reporter: mail at deltagram.eu

Not sure, if what I'm describing is a bug or simply not possible due to some
aspect of how tags are stored internally. What I'm trying to do is the (to me)
simple task of reorganizing the tag hierarchy. To give a simple example, do the
following:

1. Open Digikam
2. Open the tag manager
3. Click any tag and drag-and-drop it to under another tag
4. Close the tag manager
5. Close Digikam
6. Re-open Digikam

Upen re-opening Digikam the tag that was moved should still be under the new
tag, shouldn't it? At least that's what I would expect.

But that is not what is happening. The procedure described above only seems to
work for single tags without subtags. When trying to move a tree of tags (e.g.
a tag with a subtag), however, nothing seems to change in the database at all:
The tag-tree does appear to be filed under the new tag only for the moment -
upon re-opening Digikam, however, the changes are reverted and the tags are
back where they were before.

Note: It's possible to completely lose a huge number of tags by this procedure
(this happened to me), when whole tag trees are moved and then the original
(now seemingly empty) root tags are deleted. Upon re-opening Digikam those root
tags are gone, of course, but the tag trees that were moved before have
disappeared as well and can't be resurrected.

By the way: This seems to be a long-standing issue. The problem was present in
version 4.12 and is still unresolved in 5.1.

Reproducible: Always

Steps to Reproduce:
1. Open Digikam
2. Open the tag manager
3. Click any tag that has subtags and drag-and-drop it to under another tag
4. Close the tag manager
5. Close Digikam
6. Re-open Digikam
7. Check the tag manager.

Actual Results:  
After re-opening Digikam the changes to the tag trees (tags with subtags) are
reverted: The tags are back where they were before moving them.

Expected Results:  
After re-opening Digikam the re-organized tag trees (tags with subtags) should
keep their new position in the hierarchy.

The problem appears on Linux (not sure about other plattforms) in every
configuration I tried (with or without "lazy synchronization", with or without
writing to sidecars etc.), was present in version 4.12 and is still present in
5.1.1.

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