Modified code so that the user is signed out of a selected account rather than all accounts.

Feature Request: https://github.com/bluesky-social/social-app/issues/4775
Bug: https://github.com/bluesky-social/social-app/issues/4683

src/state/session/index.tsx

@@ -120,6 +120,7 @@ export function Provider({children}: React.PropsWithChildren<{}>) {
       cancelPendingTask()
       dispatch({
         type: 'logged-out',
+        accountDid: account.did,
       })
       logEvent('account:loggedOut', {logContext})
       addSessionDebugLog({type: 'method:end', method: 'logout'})

src/state/session/reducer.ts

@@ -143,12 +143,20 @@ let reducer = (state: State, action: Action): State => {
       }
     }
     case 'logged-out': {
+      //Fetch the account ID that the user signed out from
+      const {accountDid} = action
+
+      //Find the account for which the tokens need to be cleared
+      const loggedOutAccount = state.accounts.filter(a => a.did === accountDid)
+
+      //Clear the tokens for the account that the user signed out from
+      loggedOutAccount.accessJwt = undefined
+      loggedOutAccount.refreshJwt = undefined
+
       return {
-        accounts: state.accounts.map(a => ({
-          ...a,
-          // Clear tokens for *every* account (this is a hard logout).
-          refreshJwt: undefined,
-          accessJwt: undefined,
+        //Return all the accounts. The other accounts remain unchanged, so the user will
+        //stay signed in on them.
+        accounts: state.accounts
         })),
         currentAgentState: createPublicAgentState(),
         needsPersist: true,