Creates a new #GtkSourceFileLoader object. The contents is read from the
#GtkSourceFile's location. If not already done, call
gtk_source_file_set_location() before calling this constructor. The previous
location is anyway not needed, because as soon as the file loading begins,
the @buffer is emptied.
Creates a new #GtkSourceFileLoader object. The contents is read from the #GtkSourceFile's location. If not already done, call gtk_source_file_set_location() before calling this constructor. The previous location is anyway not needed, because as soon as the file loading begins, the @buffer is emptied.