[umbrello] [Bug 516457] New: Deleting more elements used in a diagram crashes the app

https://bugs.kde.org/show_bug.cgi?id=3D516457

            Bug ID: 516457
           Summary: Deleting more elements used in a diagram crashes the
                    app
    Classification: Applications
           Product: umbrello
      Version First 25.12.1
       Reported In:
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

SUMMARY
Deleting package doesn't work: it forces me to delete whole elements first,=
 but
this crashes the app.

STEPS TO REPRODUCE
1. Create a few elements in a package
2. Use these elements in a diagram, e.g. class-diagram
3. Select all elements in the tree inside the package
4. Press "DELETE": the app crashes

OBSERVED RESULT
App crash instead of deleting all elements from the package and from the
diagram.

EXPECTED RESULT
Deleting a package should work in the most easy way: select it, press DEL,
confirm: all the elements inside the package must be deleted, all usages fr=
om
any existing diagrams must be removed and the package must be finally delet=
ed
as well.=20

SOFTWARE/OS VERSIONS
Operating System: Kubuntu 25.10
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-14-generic (64-bit)
Graphics Platform: Wayland
Processors: 16 =C3=97 11th Gen Intel=C2=AE Core=E2=84=A2 i9-11900H @ 2.50GHz
Memory: 52 GB of RAM (48.9 GB usable)
Graphics Processor 1: Intel=C2=AE UHD Graphics
Graphics Processor 2: NVIDIA T1200 Laptop GPU

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