convert_path_to_child_path

Converts filter_path to a path on the child model of this.

That is, filter_path points to a location in this. The returned path will point to the same location in the model not being filtered. If filter_path does not point to a location in the child model, null is returned.

Parameters:

this	A `GtkTreeModelFilter`
filter_path	A `GtkTreePath` to convert.

Returns:

A newly allocated `GtkTreePath`