https://bugs.kde.org/show_bug.cgi?id=478745

            Bug ID: 478745
           Summary: Crash, and clip incorrectly replaced. I uploaded a
                    simple demo to reproduce
    Classification: Applications
           Product: kdenlive
           Version: 23.08.4
          Platform: Flatpak
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: User Interface
          Assignee: j...@kdenlive.org
          Reporter: jijili...@yandex.com
  Target Milestone: ---

Created attachment 164299
  --> https://bugs.kde.org/attachment.cgi?id=164299&action=edit
kdenlive-sequence-bug

SUMMARY
I uploaded a simple demo project to reproduce.
Here it can reproduce 2 bugs:
Bug 1. Clip in sequence track incorrectly replaced by another clip, after the
original clip deleted
BUg 2. Crash caused by sequence


STEPS TO REPRODUCE
This is what I did to create the bug demo project zip:
1. Create project
2. Add to project:   1.mp4, 2.mp4, 3.mp4  , p1.jpg, p2.jpg,   

3. Create 3 sequences
4. Add those pictures and videos to the 3 sequences' tracks:
     Sequence 1:    1.mp4,  3.mp4    , p1.jpg
     Sequence 2:    1.mp4,  2.mp4    , p2.jpg
     Sequence 3:    1.mp4,  3.mp4    , p1.jpg, p2.jpg

5. Add Sequence 1 into Sequence 2
6. Add Sequence 2 into Sequence 3. Now:
     Sequence 1:    1.mp4,  3.mp4                , p1.jpg
     Sequence 2:    1.mp4,  2.mp4   , Seq 1    , p2.jpg
     Sequence 3:    1.mp4,  3.mp4   , Seq 2      , p1.jpg, p2.jpg

7. Close Sequence 1 and Sequence 2 tabs. Leave Sequence 3 tab open.
8. Save the project and close Kdenlive

9. Edit p2.jpg with a drawing app to make it different
10. Move 2.mp4 and 3.mp4 to a sub folder to make them in different path

(Now I packed all the files into zip)

(Developer start from below to reproduce bug)
1. Open the project in Kdenlive 
2. Click "Use placeholders for missing clips" and "OK"
3. Delete 1.mp4, 2.mp4, 3.mp4 in project bin. Notice when you delete 2.mp4, no
warning cause Sequence 2 is not open !!
4. Doubleclick Sequence 2 to open its tab. You see the place of 2.mp4 in track
incorrectly replaced by a no-audio Seq 3 !!
5. Doubleclick Sequence 1 to open its tab. Crash !!

OBSERVED RESULT
Described above 

EXPECTED RESULT


SOFTWARE/OS VERSIONS
Kdenlive 23.08.4 flatpak on Linux

ADDITIONAL INFORMATION

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