https://bugs.kde.org/show_bug.cgi?id=508633

            Bug ID: 508633
           Summary: Duplicates freezes, cant sort by Similarity, or resize
    Classification: Applications
           Product: digikam
      Version First 8.7.0
       Reported In:
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Maintenance-Similarities
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

Created attachment 184369
  --> https://bugs.kde.org/attachment.cgi?id=184369&action=edit
Scanning, getting to 100, and moment pause happens with no UI change

SUMMARY
* Looking at Similarity > Duplicates file display after searching, you can't
resize the two columns 'Items' and 'Simiiliarity'

* Clicking on column Similarity toggles the sort icon, but doesn't do anything.
(Marked as patched before, unsure if that means "only in the beta" or "GA
released")

* when scanning a fairly new set of folders with overlapping backups - 47k
images with 44k duplicates, after processing as a queue at the bottom of the
screen and gets to 100%, The ref images updates after a moment, but the program
freezes for several minutes.  

During this time. the disk is not in use, the CPU has low usage, and the
program only shows a Windows-hourglass as it isn't taking input at all.

After it finishes an internal process, then the program is running fast again -
sorting and selecting images is fast.



STEPS TO REPRODUCE
1.  Deleted database, and imported folders relating to overlapping images 44k
2.  Run 'Update thumbprints', and run 'Find Duplicate'.
3. run Find Duplicate again with 'prefer selected album' as option. 

OBSERVED RESULT

Update thumbprints - 35s
Scan for duplicates with default settings - ~1min 50s
Time after hitting 100% before screen refreshes - +9min more
Rescan for duplicates - very little delay from 100% to showing.
Rescan with "Prefer selected album (24)" - 7min
Rescan without changing settings - 7min

EXPECTED RESULT

Either immediate result (like rerunning the second time), OR, activities to be
on a second thread so that program doesn't stop responding while something is
processed, and some UI indication of what work is going on ("building results")

I can only guess that it is pre-generating all the page results, but it feels
strange that the program is literally generating "program not responding"
alerts and very little activity in the meantime.

SOFTWARE/OS VERSIONS
Windows:  Win 11 24h2 (latest)


ADDITIONAL INFORMATION

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