Draft: Make it possible to reload PangoFontMaps on changes
Support for reloading the PangoFontMap used by GTK on changes was added in 74b8297e (see also the discussion at https://bugzilla.gnome.org/show_bug.cgi?id=536185). Anyway that was conditionally compiled for X11 and Wayland, as such it didn't work on Windows or macOS (unless running with the X11 backend on OSX). This MR makes that functionality available regardless of the GDK backends enabled at configuration.
Monitoring for changes in the system fontmap or configuration on Windows / macOS still has to be done
Edited by Luca Bacci