Registers a function to deserialize object of a given type.
Since 4.20, when looking up a deserializer to use, GTK will
use the last registered deserializer for a given mime type,
so applications can override the built-in deserializers.
Parameters
mime_type: string
the mime type which the function can deserialize from
Registers a function to deserialize object of a given type.
Since 4.20, when looking up a deserializer to use, GTK will use the last registered deserializer for a given mime type, so applications can override the built-in deserializers.