[racket] online check syntax error display tweak

On Fri, Sep 9, 2011 at 10:04 AM, Sam Tobin-Hochstadt <samth at ccs.neu.edu> wrote:
> I like this a lot (I'm one of the those people too).  It would be
> great if either or both of clicking the "Jump to error" button or
> clicking on the red highlighting enabled the highlighting of the
> actual error.

It would also be nice if hovering over the bar would show a popup with
the actual issue. Again I use that feature in IntelliJ Idea; so I'm
not dreaming this up myself.