fix: render the participants in same order as they are created

demos/sequence.html

@@ -164,6 +164,13 @@
       end
     </pre>
 
+    <pre class="mermaid">
+    sequenceDiagram
+      actor Alice
+      actor John
+      Alice-xJohn: Hello John, how are you?
+      John--xAlice: Great!
+    </pre>
     <script type="module">
       import mermaid from './mermaid.esm.mjs';
       mermaid.initialize({
@@ -174,7 +181,7 @@
         flowchart: { curve: 'basis' },
         gantt: { axisFormat: '%m/%d/%Y' },
         sequence: { actorMargin: 50 },
-        // sequenceDiagram: { actorMargin: 300 } // deprecated
+        sequenceDiagram: { actorMargin: 300 }, // deprecated
       });
     </script>
   </body>