[Digikam-devel] [digikam] [Bug 334633] New: Album metadata sorted in non-deterministic way in some cases

[Michal Sylwester]

https://bugs.kde.org/show_bug.cgi?id=334633

            Bug ID: 334633
           Summary: Album metadata sorted in non-deterministic way in some
                    cases
    Classification: Unclassified
           Product: digikam
           Version: 4.0.0
          Platform: Compiled Sources
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: NOR
         Component: Metadata
          Assignee: digikam-devel at kde.org
          Reporter: msylwester at gmail.com

When sorting by metadata it is likely that several albums will have exactly
same sorting key (came category or same date). In such case order of such
albums is random and changes on every re-sort.

Reproducible: Always

Steps to Reproduce:
1. Sort albums by metadata (category or date)
2. Make sure there are at least 2 albums with same category/date that are
siblings in album tree
3. Expand/collapse a album tree branch to trigger re-sort
Actual Results:  
Albums jump around more or less randomly

Expected Results:  
Albums stay in-place with the branch expanded/collapsed

I think it is necessary to add additional sorting key in case of primary key
conflict. Sorting by album name is deterministic as duplicate names are not
allowed, not so with metadata.

My suggestion: make "sort by category/date" mean "sort by category/date, then
by album name".

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