Icewalls can no longer be knocked back (see bugreport:38)

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@12083 54d463be-8e91-2dee-dedb-b68131a5f0ec

Changelog-Trunk.txt

@@ -4,6 +4,8 @@ AS OF SVN REV. 5091, WE ARE NOW USING TRUNK.  ALL UNTESTED BUGFIXES/FEATURES GO
 IF YOU HAVE A WORKING AND TESTED BUGFIX PUT IT INTO STABLE AS WELL AS TRUNK.
 
 
+2008/01/17
+	* Icewalls can no longer be knocked back (see bugreport:38)
 2008/01/15
 	* Manner system fixing [ultramage]
 	- better-than-aegis 'red bubble' packet updates; now it shows correctly

src/map/skill.c

@@ -9835,8 +9835,11 @@ int skill_unit_move_unit_group (struct skill_unit_group *group, int m, int dx, i
 	if (group->unit==NULL)
 		return 0;
 
-	if (skill_get_unit_flag(group->skill_id)&UF_ENSEMBLE) //Ensembles may not be moved around.
-		return 0;
+	if (skill_get_unit_flag(group->skill_id)&UF_ENSEMBLE)
+		return 0; //Ensembles may not be moved around.
+
+	if( group->unit_id == UNT_ICEWALL )
+		return 0; //Icewalls don't get knocked back
 
 	m_flag = (int *) aCalloc(group->unit_count, sizeof(int));
 	//    m_flag