The only reliable way I found was
1. create a boolean flag field, set it to false
2. before the new range is pulled, set the flag to true
- ignore onProxyChange() if the flag is set to true
3. when either onSuccess(), onViolation() or onFailure() is called,
schedule a deferred command to set the flag to false.
- a deferred command is important because the order of onProxyChange
and the range pull callbacks seems to be nondeterministic
It would be very helpful if GWT provided a different enum constant for the
first encounter of the proxy.
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