[Qt-interest] Qusetion about setIconSize() ?

[Kermit Mei]

Hello community!

If my picture's size is 48X48, and I use it as a QPushButton's icon. Can
I set the icon's size as 56x56? I did it, but there's no effect.

When I set the picture's size as 56x56 using GIMP, then I can see the
big icon after setting it with "btn->setIconSize(QSize(56,56));"

Why? Does Qt can't use small picture as a icon if you want to show it
more than the picture itself?

Thanks.
Kermit