[kmail2] [Bug 506828] New: Crash, when selecting multiple addresses of a distribution list

[Elias Probst]

https://bugs.kde.org/show_bug.cgi?id=506828

            Bug ID: 506828
           Summary: Crash, when selecting multiple addresses of a
                    distribution list
    Classification: Applications
           Product: kmail2
      Version First 6.4.3
       Reported In:
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: composer
          Assignee: kdepim-bugs at kde.org
          Reporter: mail at eliasprobst.eu
  Target Milestone: ---

Created attachment 183106
  --> https://bugs.kde.org/attachment.cgi?id=183106&action=edit
GDB backtrace of crashed KMail

SUMMARY
Selecting multiple recipients from a distribution list (click, hold shift,
click) causes KMail to crash.

STEPS TO REPRODUCE
1. Compose a new mail
2. Open recipient picker
3. Expand a distribution list
4. Click on the 1st contact of the list
5. Hold shift and click on the last contact of the list

OBSERVED RESULT
KMail freezes & crashes (full BT is attached):

#0··0x00007fffe569f59d·in·QSortFilterProxyModel::sibling(int,·int,·QModelIndex·const&)·const·()·at·/nix/store/l9kvcx3wna1bla7xpy1629hawjqmna4y-qtbase-6.9.0/lib/libQt6Core.so.6⏎ 
  3859 
#1··0x00007fffe355c6ad·in·QModelIndex::sibling·(acolumn=0,·this=0x7ffffffefce0,·arow=2)·at·/nix/store/l9kvcx3wna1bla7xpy1629hawjqmna4y-qtbase-6.9.0/include/QtCore/qabstractitemmodel.h:509⏎ 
  3860 
#2··Akonadi::EntityTreeViewPrivate::slotSelectionChanged·(this=0x347d010,·selected=...,·deselected=<optimized·out>)·at·/build/akonadi-25.04.3/src/widgets/entitytreeview.cpp:110⏎ 
  3861  ········row·=·2⏎                                                        
  3862  ········index·=·{r·=·1,·c·=·0,·i·=·1,·m·=·{ptr·=·0x2aa0670}}⏎           
  3863 
········range·=·@0x299df80:·{tl·=·{d·=·0x3629f60},·br·=·{d·=·0x3a8ecc0}}

EXPECTED RESULT
KMail allows me to add the selected contacts as recipients of the mail I'm
composing

SOFTWARE/OS VERSIONS
Operating System: NixOS 25.11
KDE Plasma Version: 6.4.2
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.0
Kernel Version: 6.15.4 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen AI 5 340 w/ Radeon 840M
Memory: 32 GiB of RAM (30.6 GiB usable)
Graphics Processor: AMD Radeon Graphics 

ADDITIONAL INFORMATION

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