QLineEdit completion in QDialog is not clickable

The list created by QCompleter in QLineEdit is not clickable if it appears inside QDialog. It can only be selected using keyboard.

To reproduce, run the attached example:

1. Click push button
2. Dialog with line edit appears. Start typing "Str"
3. The list of completions appears. Try clicking/scrolling the list

Result: the clicks are ignored.

Expected result: mouse works normally.

This works correctly in older versions of Qt. Also, it works correctly in the main window, as can be seen in the attached example.