Unit Display: When an invisible enemy unit recruits another invisible unit, don't scroll to their location

[jostephd]

Scrolling to them would leak their location to the player.

edit: To test this:

diff --git a/data/campaigns/Heir_To_The_Throne/scenarios/01_The_Elves_Besieged.cfg b/data/campaigns/Heir_To_The_Throne/scenarios/01_The_Elves_Besieged.cfg
index 805f25cc67..4c9fb338bc 100644
--- a/data/campaigns/Heir_To_The_Throne/scenarios/01_The_Elves_Besieged.cfg
+++ b/data/campaigns/Heir_To_The_Throne/scenarios/01_The_Elves_Besieged.cfg
@@ -6,7 +6,8 @@
     victory_when_enemies_defeated=no
     map_data="{campaigns/Heir_To_The_Throne/maps/01_The_Elves_Besieged.map}"
     {TURNS 16 14 12}
-    {DEFAULT_SCHEDULE}
+    {SECOND_WATCH}
+    {DAWN}
 
     {SCENARIO_MUSIC "battle.ogg"}
     {EXTRA_SCENARIO_MUSIC "casualties_of_war.ogg"}
@@ -160,13 +161,14 @@
 #enddef
 
     [side]
-        type=Orcish Warlord
+        {QUANTITY type Nightgaunt Nightgaunt Lich}
         id=Urug-Telfar
         name= _ "Urug-Telfar"
         side=2
+        x,y=31,3
         canrecruit=yes
         profile=portraits/orcs/grunt-2.png
-        recruit=Orcish Warrior,Goblin Knight,Goblin Pillager,Orcish Crossbowman,Orcish Assassin,Troll
+        {QUANTITY recruit Shadow Skeleton Shadow}
         gold=400
         [ai]
             recruitment_pattern=scout,fighter,mixed fighter,archer
@@ -187,6 +189,7 @@
         id=Knafa-Tan
         name= _ "Knafa-Tan"
         side=3
+        x,y=9,4
         canrecruit=yes
         recruit=Orcish Warrior,Wolf Rider,Orcish Crossbowman,Orcish Assassin,Troll
         {EBESIEGED_RECRUITMENT}
@@ -208,6 +211,7 @@
         id=Maga-Knafa
         name= _ "Maga-Knafa"
         side=4
+        x,y=9,5
         canrecruit=yes
         recruit=Orcish Warrior,Wolf Rider,Orcish Crossbowman,Troll Warrior,Orcish Slayer
         {EBESIEGED_RECRUITMENT}

[jyrkive]

Thanks for the pull request. :)