Unlock target when setunitdata TARGETID 0 (#5578)

Fixes #5577

doc/script_commands.txt

@@ -8337,6 +8337,7 @@ Parameter (indexes) for NPCs are:
 		- *_ADELAY: see doc/mob_db.txt
 		- *_DMOTION: see doc/mob_db.txt
 		- *_BODY2: enable (1) the alternate display, or disable (0)
+		- *_TARGETID: when set to 0 the unit will release the target and stop attacking
 
 		- UMOB_AI: none (0); attack (1); marine sphere (2); flora (3); zanzou (4); legion (5); faw (6)
 		- UMOB_SCOPTION: see the 'Variables' section at the top of this document

src/map/script.cpp

@@ -18326,6 +18326,10 @@ BUILDIN_FUNC(setunitdata)
 			case UMOB_ADELAY: md->base_status->adelay = (short)value; calc_status = true; break;
 			case UMOB_DMOTION: md->base_status->dmotion = (short)value; calc_status = true; break;
 			case UMOB_TARGETID: {
+				if (value==0) {
+					mob_unlocktarget(md,gettick());
+					break;
+				}
 				struct block_list* target = map_id2bl(value);
 				if (!target) {
 					ShowWarning("buildin_setunitdata: Error in finding target for BL_MOB!\n");
@@ -18391,6 +18395,10 @@ BUILDIN_FUNC(setunitdata)
 			case UHOM_ADELAY: hd->base_status.adelay = (short)value; calc_status = true; break;
 			case UHOM_DMOTION: hd->base_status.dmotion = (short)value; calc_status = true; break;
 			case UHOM_TARGETID: {
+				if (value==0) {
+					unit_stop_attack(&hd->bl);
+					break;
+				}
 				struct block_list* target = map_id2bl(value);
 				if (!target) {
 					ShowWarning("buildin_setunitdata: Error in finding target for BL_HOM!\n");
@@ -18501,6 +18509,10 @@ BUILDIN_FUNC(setunitdata)
 			case UMER_ADELAY: mc->base_status.adelay = (short)value; calc_status = true; break;
 			case UMER_DMOTION: mc->base_status.dmotion = (short)value; calc_status = true; break;
 			case UMER_TARGETID: {
+				if (value==0) {
+					unit_stop_attack(&mc->bl);
+					break;
+				}
 				struct block_list* target = map_id2bl(value);
 				if (!target) {
 					ShowWarning("buildin_setunitdata: Error in finding target for BL_MER!\n");
@@ -18563,6 +18575,10 @@ BUILDIN_FUNC(setunitdata)
 			case UELE_ADELAY: ed->base_status.adelay = (short)value; calc_status = true; break;
 			case UELE_DMOTION: ed->base_status.dmotion = (short)value; calc_status = true; break;
 			case UELE_TARGETID: {
+				if (value==0) {
+					unit_stop_attack(&ed->bl);
+					break;
+				}
 				struct block_list* target = map_id2bl(value);
 				if (!target) {
 					ShowWarning("buildin_setunitdata: Error in finding target for BL_ELEM!\n");