Description:
Impress crash if the selection is done by keyboard (using shift + arrow keys) or by double clicking by mouse.

Steps to Reproduce:
1. Create a new file
2. Change the layout of the slide to "Title, Content" (or add a new slide which defaults to "Title, Content" layout)
3. The content is now automatically formatted to be in an unordered list
4. Increase the list level to 3 or more by positioning the cursor to the beginning of line of the list item and then pressing "Tab" key from the keyboard twice (or more)
5. Write anything in that level-3 list item
6. Select the content of the level-3 list item by keyboard (shift + arrows key) or by mouse (double click)
7. Crash

Actual Results:
Impress crashes

Expected Results:
Impress does not crash


Reproducible: Always


User Profile Reset: No

Additional Info:
Happens in safe mode as well

Version: 24.8.4.2 (X86_64) / LibreOffice Community
Build ID: 480(Build:2)
CPU threads: 8; OS: Linux 6.12; UI render: default; VCL: gtk3
Locale: en-US (en_US.UTF-8); UI: en-US
24.8.4-2
Calc: threaded