Comment 4 for bug 1552518

I reworked the inline-toolbar styling according to Adwaita (from Gtk3.18.6) and that looks a lot better now.

However, the pen-ultimate button in the inline-toolbar is still drawn as a first-child and to be honest I have no clue as to why. What makes this even a little odder is that if you look at the app with the Gtk Inspector and the mark the button in question it gets redrawn correctly(!).
(See the attached image for Menulibre after the redraw effect.)