Notify other open tabs of updates to localStorage #7550
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…tion-library-for-js into localStorage-update-events
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In v4 we added encryption of localStorage entries, which also makes use of an in-memory cache to avoid constantly decrypting localStorage. This had the side effect of creating scenarios where multiple open tabs may have diverging cache states until they refresh and resync with localStorage. This PR adds broadcasting of localStorage updates to notify other open tabs or other instances of MSAL they should pull the latest changes into their respective in-memory cache objects.
On a related note: This PR also implements broadcasting for the Account Added and Account Removed events since these can no longer rely on the localStorage update events due to those values now being encrypted.