Bug#770840: ark: Ark crashes on exit when nested archives opened

[Fred F <frederik.vogelsang@gmail.com>]

Unfortunately this bug is still present in stable (jessie), as the
package version there is still 4.14.2-2 as of today. Any chance this
could also be fixed in stable?

It even looks like the debian patch in 4.14.2-2
(upstream_remove_part_from_KXMLGUIFactory_on_exit) is partially
involved in this.