rusackas commented on a change in pull request #18773:
URL: https://github.com/apache/superset/pull/18773#discussion_r809564166



##########
File path: superset-frontend/src/preamble.ts
##########
@@ -67,3 +72,24 @@ export const theme = merge(
   supersetTheme,
   bootstrapData?.common?.theme_overrides ?? {},
 );
+
+const getMe = makeApi<void, User>({
+  method: 'GET',
+  endpoint: '/api/v1/me/',
+});
+
+/**
+ * When you re-open the window, we check if you are still logged in.
+ * If your session expired or you signed out, we'll redirect to login.
+ * If you aren't logged in in the first place (!isActive), then we shouldn't 
do this.
+ */
+if (bootstrapData.user?.isActive) {
+  document.addEventListener('visibilitychange', () => {
+    // we only care about the tab becoming visible, not vice versa
+    if (document.visibilityState !== 'visible') return;

Review comment:
       Agree with @suddjian , but good callout — I always appreciate a 
performance-oriented mindset




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