[perxcfse] Automatic anchors for code navigation

Much of editing code is not typing text, but moving around.  Create an IDE which automatically computes and shows markers for where the user might want to go to next.  The markers could be F1 through F10.  Or Alt-A through Z.

Where are these likely targets?  AI?  User studies?

While typing arguments to a function, one might want to jump back to the function name.

While working on the branches of an"if", one might want to jump back to the predicate.

If the user commits an error (Eclipse style constant recompilation), one might want to jump back to the site of the error.