When the GUI interface for fontforge is disabled, it installs a useless desktop file in /usr/share/applications/org.fontforge.FontForge.desktop Running this file does nothing, as Terminal=false, and it doesn't support any graphical mode. Currently I do the following in my configuration (/etc/portage/env/media-gfx/fontforge): INSTALL_MASK=" /usr/share/applications /usr/share/fontforge /usr/share/icons /usr/share/metainfo /usr/share/mime /usr/share/pixmaps " But I feel this should be handled in the ebuild.
I should note that I've ran with this INSTALL_MASK for as long as I can remember (potentially since around 2020), and nothing has broken, as I'm pretty sure that the excluded directories are only used for the GUI.