When editing a widget's properties in the Widget Design view, specifically for the minimumSize property, the editor for the height sub-property is incorrectly rendered as a combo box (QComboBox) instead of a spin box (QSpinBox).  

Steps to Reproduce:

Open a new or existing UI file (.ui) in Qt Creator.

Select any widget (e.g., QPushButton, QLabel).

In the Properties editor, expand the minimumSize property.

Attempt to edit the height sub-property.