not sure why you think those buttons are not streched to fit the label but thet are, the up button is not the same widget since it doesn't have an arrow which opens a list next to it, the issue is not specific to nautilus other gkt applications using such button have the same behaviour, it would also look weird to have lot of spacing around the text there
not sure why you think those buttons are not streched to fit the label but thet are, the up button is not the same widget since it doesn't have an arrow which opens a list next to it, the issue is not specific to nautilus other gkt applications using such button have the same behaviour, it would also look weird to have lot of spacing around the text there