The answer to a save lists the changes other sessions stored before it,
such as the backend's repair of a damaged file. When the answer came
before the message with such a change, the saved commit was
acknowledged first, and the late change was then applied on top of the
local edits instead of under them, out of the server's order.
A saved commit of the open file now stays pending until this tab has
received every change the answer lists from other sessions, so a late
change is applied under the local edits. If one does not arrive within
10 seconds, the file reloads.
2114d95a2e