* Reapply "Increase the length of unsaved doc time before the editor is locked (#23431)"
This reverts commit d0efca398e59ca488c530ee9ec5ca76f29843679.
* Use pendingOpCreatedAt if inflightOpCreatedAt isn't set
GitOrigin-RevId: b3301d7cc1554215a4ba569537bd47beeefde20f
* Use opInflightSince to measure unsaved doc time
* Use performance.now() for lastAcked timestamp
* Use inflightOpCreatedAt
* Increase MAX_UNSAVED_ALERT_SECONDS to 15
* Increase MAX_UNSAVED_SECONDS to 30
* Increase FATAL_OP_TIMEOUT to 45000
* Convert "Connection lost" modal to a notification
GitOrigin-RevId: 2d4233723620fd03ce6d6c5795c48c33c0b2f92c
* Add type for externalUpdate
* Log clientTracking.getConnectedUsers error
* Remove update debugging code
* Use ErrorMetadata type
* Use Message type
* Remove unused document:opened event
GitOrigin-RevId: 3a1d1e785dca37d6b91cd650fbcb4e5decb6343b
Alf Eaton