Reference tracking (#52403)

* ref tracking

* legacy

* legacy procs

* fixes

* tweaks

* clarity comments

* wth

code/modules/admin/view_variables/topic_basic.dm

@@ -45,6 +45,18 @@
 			usr.client.admin_delete(target)
 			if (isturf(src))	// show the turf that took its place
 				usr.client.debug_variables(src)
+				return
+
+		#ifdef REFERENCE_TRACKING
+		if(href_list[VV_HK_VIEW_REFERENCES])
+			var/datum/D = locate(href_list[VV_HK_TARGET])
+			if(!D)
+				to_chat(usr, "<span class='warning'>Unable to locate item.</span>")
+				return
+			usr.client.holder.view_refs(target)
+			return
+		#endif
+
 	if(href_list[VV_HK_MARK])
 		usr.client.mark_datum(target)
 	if(href_list[VV_HK_ADDCOMPONENT])
@@ -77,5 +89,4 @@
 		message_admins("<span class='notice'>[key_name_admin(usr)] has added [result] [datumname] to [key_name_admin(src)].</span>")
 	if(href_list[VV_HK_CALLPROC])
 		usr.client.callproc_datum(target)
-	if(href_list[VV_HK_VIEW_REFERENCES])
-		usr.client.view_refs(target)
+