Node windows have inconsistent borders, padding, & alignment

This isn't a serious bug at all, but it really irks me. If you look at this image: http://i.imgur.com/nHhLh3k.png

You can see an Add node when deselected (left) and when selected (right). You'll see that the actual node window shifts to the left by one pixel when selected. I'm guessing the window style has slightly different sizes between selection states.

Also, there is no one pixel gap at the bottom of the window, assuming the one pixel border was intended.

This inconsistent alignment is also present in all other node windows, especially the ones with popup lists, because the popup button is thinner than most elements, so it has a large gap at the bottom.