I get this *exact* problem and was searching the net for an answer. I'm using 4.7.3, and it only manifests for me on macosx, not windows. Basically, the button responds to hover correctly but it seems like there is a clicking dead space all around the button. It seems to affect QPushButton and QComboBox, but maybe others.
You can take the C++ calculator example, change the Button class to inherit from QPushButton instead of QToolButton, and stick setStyleSheet("background-color:blue;"); in the constructor to reproduce.
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