in search of the next code editor

What about hyperlinks?

class Hello
{
  public Hello()
 {
   print("Hello World.");
 }
}

when you've got the ctrl key held down, becomes:

class Hello
{
  public Hello()
 {
   print("Hello World.");
 }
}

When you click the link, keywords and library functions bring up help, symbols navigate to declaration or definition, as appropriate.

Note, this does not replace good tooltips, which are also requisite. The difference is that hyperlinks denote navigation, whereas tooltips bring the help to you, in context. We should have both, and there should be a back button for reversing all navigations. Some editors already have this.