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Issuing a server request triggers `changetracking.flush` so as to make sure we're not operating on a stale state. This immediately triggers notification of any pending changes (as a result of debouncing) to the server. However, this happens in addition to the notification that is waiting on the debounce delay. Because we `nil` `buf_state.pending_change` when it is called, the fix is to also check that this is non-`nil` when it is called and exit if it is, as this being `nil` would mean that it originates from a pending change that has already been flushed out.