This is a helper function that should be called in class_init,
after installing your own properties.
To handle the properties in your set_property and get_property
functions, you can either use [func@Gtk.Editable.delegate_set_property]
and [func@Gtk.Editable.delegate_get_property] (if you are using
a delegate), or remember the @first_prop offset and add it to the
values in the [enum@Gtk.EditableProperties] enumeration to get the
property IDs for these properties.
Installs the GtkEditable properties for @class.
This is a helper function that should be called in class_init, after installing your own properties.
To handle the properties in your set_property and get_property functions, you can either use [func@Gtk.Editable.delegate_set_property] and [func@Gtk.Editable.delegate_get_property] (if you are using a delegate), or remember the @first_prop offset and add it to the values in the [enum@Gtk.EditableProperties] enumeration to get the property IDs for these properties.