[racket-dev] "bookmarks" in drracket?

When using Dr Racket, I use the right-click "Jump to definition of" a
lot but I frequently find that I also want an easy way to get back to
the code I was previously looking at. Does anyone else think this
would be a useful feature to have? I've implemented something that
adds this functionality.

If anyone wants to try it out, I've included both modified source
files (from drracket/private) and a patch.

With the code I added, a "bookmark" automatically gets saved when
jumping to a definition from the right-click menu and when choosing a
definition from the "(define ...)" menu. Multiple bookmarks accumulate
on a stack. You can also add your own bookmarks with the right click
menu.

To go back to the most recent bookmark, either use the right-click
menu, or press C-x r (is this an appropriate key binding? I chose it
because emacs similarly uses C-x r to do bookmark-related stuff).

Since I'm not very familiar with drracket code, I'm not sure I put
stuff in the right place. Would anyone mind reviewing my code? It's
only a few lines.

Also, would something like this be better as a plugin in the future?
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