api: add changed varp index to VarbitChanged event

runelite-api/src/main/java/net/runelite/api/events/VarbitChanged.java

@@ -29,9 +29,14 @@ package net.runelite.api.events;
 import lombok.Data;
 
 /**
- * An event where a varbit has changed.
+ * An event when a varbit or varplayer has changed.
  */
 @Data
 public class VarbitChanged
 {
+	/**
+	 * Index in the varp array that was changed.
+	 * For varplayer, this is the varplayer id.
+	 */
+	private int index = -1;
 }

runelite-client/src/main/java/net/runelite/client/plugins/devtools/DevToolsPlugin.java

@@ -238,7 +238,9 @@ public class DevToolsPlugin extends Plugin
 				int value = Integer.parseInt(args[1]);
 				client.setVarpValue(client.getVarps(), varp, value);
 				client.addChatMessage(ChatMessageType.SERVER, "", "Set VarPlayer " + varp + " to " + value, null);
-				eventBus.post(new VarbitChanged()); // fake event
+				VarbitChanged varbitChanged = new VarbitChanged();
+				varbitChanged.setIndex(varp);
+				eventBus.post(varbitChanged); // fake event
 				break;
 			}
 			case "getvarb":

runelite-mixins/src/main/java/net/runelite/mixins/RSClientMixin.java

@@ -1013,6 +1013,7 @@ public abstract class RSClientMixin implements RSClient
 	public static void settingsChanged(int idx)
 	{
 		VarbitChanged varbitChanged = new VarbitChanged();
+		varbitChanged.setIndex(idx);
 		client.getCallbacks().post(varbitChanged);
 	}