When in design mode for a UI file then it can be tricky to connect a signal to the parent widget if there is no gap showing it

When in design mode for a UI file then it can be tricky to connect a signal to the parent widget if there is no gap showing it. For example, if you have a QTabWidget that fills the whole form and want to connect a signal to a slot on the form itself then there is no easy way to do so since there is no way to drop the cursor to get the list of slots.

Therefore, dropping outside of the form in this case might be a good indicator that it should show the top level slots to connect to.