Fix arguments parsing for AiWander console command (bug #4458)

CHANGELOG.md

@@ -30,6 +30,7 @@
     Bug #4451: Script fails to compile when using "Begin, [ScriptName]" syntax
     Bug #4453: Quick keys behaviour is invalid for equipment
     Bug #4454: AI opens doors too slow
+    Bug #4458: AiWander console command handles idle chances incorrectly
     Feature #4256: Implement ToggleBorders (TB) console command
     Feature #3276: Editor: Search- Show number of (remaining) search results and indicate a search without any results
     Feature #4222: 360° screenshots

apps/openmw/mwscript/aiextensions.cpp

@@ -193,10 +193,18 @@ namespace MWScript
                     Interpreter::Type_Integer time = static_cast<Interpreter::Type_Integer>(runtime[0].mFloat);
                     runtime.pop();
 
+                    // Chance for Idle is unused
+                    if (arg0)
+                    {
+                        --arg0;
+                        runtime.pop();
+                    }
+
                     std::vector<unsigned char> idleList;
                     bool repeat = false;
 
-                    for(int i=1; i < 10 && arg0; ++i)
+                    // Chances for Idle2-Idle9
+                    for(int i=2; i<=9 && arg0; ++i)
                     {
                         if(!repeat)
                             repeat = true;