Make sure there is at least 150 history messages in the message array.

assets/chat/js/window.js

@@ -122,9 +122,26 @@ class ChatWindow extends EventEmitter {
         remove.forEach((element) => {
           element.remove();
         });
-
-        this.messages = this.messages.slice(lines.length - this.maxlines);
       }
+
+      let clientMessages = 0;
+      this.messages = this.messages
+        .reverse()
+        .filter((message, index) => {
+          if (clientOnlyMessages.includes(message.type)) {
+            clientMessages += 1;
+            // remove client only messages if above maxlines
+            if (index >= this.maxlines) {
+              return false;
+            }
+            // remove history message if above maxlines/maxhistory + the clientMessages
+          } else if (index >= Math.max(this.maxlines, 150) + clientMessages) {
+            return false;
+          }
+
+          return true;
+        })
+        .reverse();
     }
   }