How to create a QStyledItemDelegate made of two QDoubleSpinBox widgets

[ChrisW67]

The default behaviour will be looking to commit and close the editor when the widget you provided as the editor loses focus. I expect that widget will lose focus immediately when the focus shifts into one of its child spin boxes. You should look specifically at that event and whether you need to block it from propagating.

Cannot say I have done a lot of event filtering myself so I will be interested in the other responses.