editingFinished() signal

[Mad Max]

Well how can the spinbox lose focus at the same time it receives a keystroke?

I don't know HOW it work (it not interest me yet) , but it work well, I assure you.

Further, the spinbox may lose focus due to mouse action, and AFAIK Enter does not cause a widget to lose focus unless so explicitly configured.

Probably it emit QFocusEvent inside. Just do try it in the simple app.