Comment 1 for bug 1959327

This disappeared in the GTK3 port, but not exactly on purpose .. GtkImageMenuItem was deprecated in GTK3 (https://docs.gtk.org/gtk3/class.ImageMenuItem.html) and Pinta also switched to using gio for menus (https://docs.gtk.org/gio/class.Menu.html).

It looks like there is actually a way to get menu icons with it: https://docs.gtk.org/gio/method.MenuItem.set_icon.html, however there are a couple big issues I see:
- AFAIK there isn't a GTK setting to turn this off, like there was in GTK2 with the 'gtk-menu-images' setting that many distros had off by default. So they would show up for everyone and might look very inconsistent with other applications on the system, and I'm not sure this is a good thing
- We'd also be violating the GTK design guidelines, which say that this is intended for 'noun' menu items like bookmarks, and not for 'verb' items like Open or Save