This is a valid bug. It is ugly for buttons to be nearly the same width but not quite: they should be either exactly the same width, or obviously and intentionally very different. This means that if you customize a toolbar (possible in other applications, but currently not in Nautilus) to add a button that has a label wider than any of those currently in the toolbar, the rest of the buttons should widen to match it.
This is a valid bug. It is ugly for buttons to be nearly the same width but not quite: they should be either exactly the same width, or obviously and intentionally very different. This means that if you customize a toolbar (possible in other applications, but currently not in Nautilus) to add a button that has a label wider than any of those currently in the toolbar, the rest of the buttons should widen to match it.
I reported the equivalent bug in Mozilla in 2000 <https:/ /bugzilla. mozilla. org/show_ bug.cgi? id=60553>, and in Epiphany in 2005 <http:// bugzilla. gnome.org/ show_bug. cgi?id= 169397>.