[Freeciv-Dev] (PR#3467) AI idles fortifying units that do not move

["Per I. Mathisen" <per@xxxxxxxxxxx>]

After I had _finally_ fixed this age old problem in the AI, it reappars.
The culprit is the new explorer code, which does this

bool ai_manage_explorer(struct unit *punit)
...
  /* Idle unit, since otherwise handle_unit_move_request fails!
   * TODO: Fix it and remove this idling */
  if (punit->activity != ACTIVITY_IDLE) {
    handle_unit_activity_request(punit, ACTIVITY_IDLE);
  }

All AI military units that don't know what they can do try exploration,
and so lose their fortification status. This is very bad. Please fix it.

  - Per