Improve account switcher pending state (#3827)

* Protect against races

* Reduce UI jank when switching accounts

* Add pending state to selected account

* Disable presses while pending

src/lib/hooks/useAccountSwitcher.ts

@@ -12,7 +12,7 @@ import {logEvent} from '../statsig/statsig'
 import {LogEvents} from '../statsig/statsig'
 
 export function useAccountSwitcher() {
-  const [isSwitchingAccounts, setIsSwitchingAccounts] = useState(false)
+  const [pendingDid, setPendingDid] = useState<string | null>(null)
   const {_} = useLingui()
   const {track} = useAnalytics()
   const {initSession, clearCurrentAccount} = useSessionApi()
@@ -24,9 +24,12 @@ export function useAccountSwitcher() {
       logContext: LogEvents['account:loggedIn']['logContext'],
     ) => {
       track('Settings:SwitchAccountButtonClicked')
-
+      if (pendingDid) {
+        // The session API isn't resilient to race conditions so let's just ignore this.
+        return
+      }
       try {
-        setIsSwitchingAccounts(true)
+        setPendingDid(account.did)
         if (account.accessJwt) {
           if (isWeb) {
             // We're switching accounts, which remounts the entire app.
@@ -57,11 +60,18 @@ export function useAccountSwitcher() {
           Toast.show(_(msg`Sorry! We need you to enter your password.`))
         }, 100)
       } finally {
-        setIsSwitchingAccounts(false)
+        setPendingDid(null)
       }
     },
-    [_, track, clearCurrentAccount, initSession, requestSwitchToAccount],
+    [
+      _,
+      track,
+      clearCurrentAccount,
+      initSession,
+      requestSwitchToAccount,
+      pendingDid,
+    ],
   )
 
-  return {onPressSwitchAccount, isSwitchingAccounts}
+  return {onPressSwitchAccount, pendingDid}
 }