Opening multiple tabs may prevent proper syncing of channel changes

[bjester]

Observed behavior

Users who open multiple tabs of Studio may encounter situations where they're missing the 'Saving...' indicator in the edit modal, and may later find content they've uploaded no longer exists.

Expected behavior

Content doesn't disappear

User-facing consequences

Lost time and energy that was put into content that disappears

Errors and logs

Uncaught (in promise) Error: BroadcastChannel already has a leader-elector
    createLeaderElection leader-election.js:380
    runElection serverSync.js:397
leader-election.js:380:10

Additional information

Reproduction steps

1. To reproduce this issue, use a virtualbox VM with:

• Windows 10 OS
• 1 CPU
• 4096 MB of memory
• Firefox 108

2. Open a Studio channel in Firefox
3. Open the developer console
4. Right-click on the Firefox tab, and select 'Duplicate this tab'
5. Open the developer console on the duplicate tab
6. Refresh either tab until error appears, if it hasn't already

Usage Details

• Browser: Firefox 108 (Chrome likely too) on Windows
• URL: channel editing

[bjester]

This appears localized to Windows, as it wasn't reproducible on linux

[bjester]

Closed by #3907