Comment 3 for bug 1720677

I fixed the width "a little" in
https://gitlab.com/inkscape/inkscape/commit/8a097e957fac49ee3a34b26776d1b7738a11a308

Citing from this commit:

The underlying issue are the three icons that are squished into the
corners of scrollbars/rulers:
- in gtk2 they where shrunk down till they fit into the available
  space (which probably wasn't a great solution either)
- in gtk3 they blow up the container till it fits

A proper fix would probably be to either
a) moving those buttons elsewhere or
b) specifically design small buttons/icons for this purpose