I have a javascript file with this content:
            function foo () {
            
            }
            function bar() {
            foo()
            }

I step on foo() (I tried both on the first line or on the 5th line) and I select
menu Refactoring | Rename. I get a dialog asking for name, I type something
("ahoj") and the result is that the whole file looks like this:
            ahojfunction bar() {
            foo()
            }