Guessing extracted method name doesn't work when not selecting variable

[fbricon]

Following up on #2670, given the following code:

public static void main(String[] args) {
    int numArgs = args == null ? 0 : args.length;
    System.out.println(numArgs);
  }

when selecting args == null ? 0 : args.length;, extract method doesn't guess the name based on the variable the selected snippet is assigned to (IntelliJ IDEA does it properly):