[CSS/QCombobox] setting min-height for drop down list

[spirit]

It works!But I wonder if every QComboBox uses "combo->setView(new QListView());",Could it cause memory leak？

No, it couldn't.
The doc says:

Sets the view to be used in the combobox popup to the given itemView. The combobox takes ownership of the view.

Read about QComboBox::setView carefully.