[REG] Mac checkable menu stays on parent click (works in 6.4.3 + 6.4.0b2)

1. Build and Run attacked example with Qt 6.5.0
2. Fold out the combobox.
3. Click anywhere on the dialog - notice that the combobox popup does not close (also when clicking the popup button)
4. Do the same with Qt 6.4.3 - it works there (hence it is a regression)