[umbrello] [Bug 516370] New: Selecting more elements in diagram not working

https://bugs.kde.org/show_bug.cgi?id=3D516370

            Bug ID: 516370
           Summary: Selecting more elements in diagram not working
    Classification: Applications
           Product: umbrello
      Version First 25.12.1
       Reported In:
          Platform: Ubuntu
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

SUMMARY
Selecting more elements in a diagram with the mouse (dragging a rectangle) =
is
useless - I can't decide if it's too slow (taking like 1 minute to really
select anything) or just not working at all.

STEPS TO REPRODUCE
1. Start to drag somewhere on the diagram, i.e. class-diagram
2. Continue dragging over more elements
3. Release the mouse

OBSERVED RESULT
Only the 1st element is selected, then actually - after like 30-80 secs - a=
 few
others get selected as well; the selection is not adjustable (like
ctrl+clicking to add more elements) and making a new selection altogether is
also not possible.

EXPECTED RESULT
The dragged-over elements must be selected, all of them, immediatelly.

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

ADDITIONAL INFORMATION
Latest everything ever few days.

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