GtkAboutDialog License Button not hidden
Steps to reproduce
Create a About Dialog, and set a license type instead of a license from string see attached examplebugreport.py
Current behavior
Use set_license_type() to set a license and set_license(None) to hide the license button
Expected outcome
License Button should be hidden
Version information
GTK 3.22.28 OS: Windows, Linux (only some Desktops, for example XCFE)
Additional information
On Gnome this seems to work fine, but not all other desktops