Description:
When using Data → Validity in Calc, LibreOffice 25.8.1 on Windows freezes as soon as I try to select a cell range as the source. From that moment, I cannot return to the sheet, switch tabs, or close the document. The program becomes unresponsive and must be killed from Task Manager (Ctrl+Shift+Esc).

This issue does not happen in the Still release (downgrade tested), so it seems to be a regression in the Fresh branch (25.8.1).

Steps to Reproduce:
1. Open Calc and create a new spreadsheet.
2. Go to menu Data → Validity.
3. In the Criteria tab, choose “Cell range” as source.
4. Click on the button to shrink/select range (or try to select manually).
5. Calc becomes stuck: it is impossible to select cells, return to the sheet, or close the window.


Actual Results:
Calc freezes and must be terminated via Task Manager.

Expected Results:
Should allow selecting a cell range for data validity without freezing.


Reproducible: Always


User Profile Reset: Yes

Additional Info:
Workaround:
1.Typing the cell range manually works.
2. Downgrading to Still release fixes the issue.