cb86745245
We currently don't have any shadow class for combo box popups, which means the default shadow of normal windows is used. That's clearly odd given that the two are very different, and isn't consistent with GTK+-3's client-side shadows for popups. While we could add a dedicated shadow class, the designers are fine with reusing the existing shadow for dropdown-menus, so let's do that. https://bugzilla.gnome.org/show_bug.cgi?id=744667