Oxygen Editor multi-user or multi-tab editing support.
This solution is covering case of Multi-User Editing & Edit Locking.
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Note: for Asura user, just go to Asura page (https://oxyrealm.com/asura) and click "Upgrade your existing license" (for free ofc), but if you want to support this plugin development, please consider fund this plugin instead.
Download the free Asura Lite version from https://wordpress.org/plugins/asura-lite