Relay Refetch container refetch method does not have prev Fragment variables

I am using refetch container to set different set of variable, but overriding only subset of all the variables.
fragmentVariables always have initial value passed from QueryRenderer

```
setRelayVariables = (variables, stateVariables) => {
const refetchVariables = fragmentVariables => {
// fragment variables always have initial variables passed from QueryRenderer
return ({
...fragmentVariables,
...variables,
});
};
if (stateVariables) {
this.setState(stateVariables);
}
this.props.relay.refetch(refetchVariables, null, (error) => {
if (error) {
console.log('ERROR while refetching', error);
}
if (stateVariables && stateVariables.isLoading) {
this.setState({
isLoading: false,
});
}
});
}
```

As per the documentation prev Variables should be accessible in refetchVariables function.

**Or, a function that receives the previous set of variables used to query the data, and returns a new set of variables to pass to the refetchQuery when fetching it from the server.**

Did anyone face similar issue ?

Start at the refetch container's refetch entry point and inspect how the refetchVariables callback is invoked relative to the QueryRenderer variables. Compare that behavior with the documented previous-variable contract in the issue. Done means the callback receives the previous variables when overriding only a subset; verify the behavior with the relevant refetch-container test if one is available.

Written by the indexing model from the issue text.