Dear Maintainer,

Konsole loses the ability to open folders by the app menu (right click → "Open
File Manager", also some of the "Open Folder With..." items) if `mc` was ever
started in its session.

Steps to reproduce:

1. Start a fresh Konsole session.

2. Launch `mc` in it. (Even if you exit it immediately, the behavior will
stay.)

3. Try to launch a file manager from the app menu (right click). You'll get the
error message about "The file or folder //<host>/<path> does not exist".

Probably, it's `mc` more to blame, as if seemingly breaks something in the
session, but I couldn't find what exactly. The environment seems unchanged (I
tried to save and compare `printenv` output before and after launching mc).
Maybe, something in dbus state gets broken?