Signature help should select the 1st parameter after the opening round bracket

[fbricon]

With "java.signatureHelp.enabled": true, given:

public class App {

    public void foo() {
        bar
    }

    public void bar(String p1, String p2) {
    }
}

When you add the parentheses after bar, the 1st param from the signature help is not selected. adding spaces would select it. This should not be necessary to select the 1st param. Looks like there's an off-by-1 error in the signature help resolution algo.