https://bugs.kde.org/show_bug.cgi?id=447233

            Bug ID: 447233
           Summary: Incorrect display of album thumbnails
           Product: digikam
           Version: 7.4.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Thumbs-Album
          Assignee: digikam-bugs-n...@kde.org
          Reporter: hakapesz...@gmail.com
  Target Milestone: ---

SUMMARY
Environment: Linux Mint 20.2 (64bit); Windows 10 (64bit); DigiKam 7.4 and
earlier (6.x; 7.x version)
Database elements: 35823

Digikam displays thumbnails incorrectly in some cases, but unfortunately I
can’t link it to any event, why happening this.
I attached it to the ticket a database dump file and an (empty) SQlite
thumbnails file, in this the error is reproduce.

What happen?
After 15849 element the displayed thumbnail elements slide on top of each
other, and after 31320 elements empty albums are displayed.

Places where there are problems:
15849 beetween 15891 elements
17488 beetween 1511 elements
17528 beetween 17529 elements
17603 beetween 17606 elements
17488 beetween 17511 elements
17528 beetween 17529 elements
19375 beetween 19456 elements
19464 beetween 19505 elements
21485 beetween 21486 elements
22245 beetween 22246 elements
25014 beetween 25015 elements
25310 beetween 25311 elements
25952 beetween 25971 elements
26037 beetween 26038 elements
26091 beetween 26098 elements
26110 beetween 26156 elements
26289 beetween 26321 elements
etc.
and after 31320 only empty albums

STEPS TO REPRODUCE
1. Environment preparation:
Use the attached database files.

Database settings in digikam:
Core DB name: digikamdb
Thumbs DB folder: attached but empty SQlite database
Face DB name: digikamface
Similarity DB name: digikamsimilar

Digikam settings:
View -- Sort Albums: By Folder
View -- Sort Items: By Name
View -- Item Sort Order: Ascending
View -- Separate Items: By Album
View -- Item Separation Order: Ascending
View -- Include Tag Sub-Tree

2. 
-- Click the parent album (ADATBANK_01)
-- Thumbnails are loaded (only white document icons). Database contain 35823
elements.
-- Scroll to 15849 element and watch what happens (thumbnail elements slide on
top of each other).
-- Scroll to the locations specified above and watch what happens
-- Find the 17528 element (in the Album only displayed 1 element). Click left
button this item and chose Go To -- Album: All items in the album are
displayed.


SOFTWARE/OS VERSIONS
Windows: Windows 10 (64 bit)
Linux/KDE Plasma: Linux Mint Cinnamon (64 bit) -- appimage

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