Fix State Machine Updates

Author: rcosta358

client/src/webview/script.ts

@@ -227,8 +227,10 @@ export function getScript(vscode: any, document: any, window: any) {
                 if (!showAllDiagnostics && selectedTab === 'diagnostics') updateView();
                 break;
             case 'fsm':
-                stateMachine = msg.sm as LJStateMachine;
-                if (selectedTab === 'fsm') updateView();
+                if (msg.sm && msg.sm !== stateMachine) {
+                    stateMachine = msg.sm as LJStateMachine;
+                    if (selectedTab === 'fsm') updateView();
+                }
                 break;
             case 'context':
                 context = msg.context as LJContext;