v0.6.8

Fixed

• A Dropdown submenu could only be reached by hovering, so on a touch screen
  a parent row such as More did nothing at all: hover has no counterpart
  there, and the row took no other action. A tap opens it now, and closes it
  again.
• A Dropdown submenu opened to the right in a right-to-left layout, back
  over the menu it belongs to rather than away from it.