Check whether g_value_transform() is able to transform values
of type src_type into values of type dest_type. Note that for
the types to be transformable, they must be compatible or a
transformation function must be registered.
Parameters
src_type
Type:GType
Source type.
dest_type
Type:GType
Target type.
Return value
Type:gboolean
TRUE if the transformation is possible, FALSE otherwise.