Add ChatboxPanelManager to allow for more advanced chatbox inputs

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

@@ -26,6 +26,7 @@ package net.runelite.mixins;
 
 import java.awt.Rectangle;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 import net.runelite.api.HashTable;
@@ -559,4 +560,14 @@ public abstract class RSWidgetMixin implements RSWidget
 		client.revalidateWidget(this);
 		client.revalidateWidgetScroll(client.getWidgets()[TO_GROUP(this.getId())], this, false);
 	}
+
+	@Inject
+	@Override
+	public void deleteAllChildren()
+	{
+		if (getChildren() != null)
+		{
+			Arrays.fill(getChildren(), null);
+		}
+	}
 }