New issue 242 by techtonik: prevent double 'm' form submit
http://code.google.com/p/rietveld/issues/detail?id=242
If you press Submit button twice on Publish+Mail Comments ('m') form - the
same comment will appear multiple times. See 2nd and 3rd comments on
http://codereview.appspot.com/2442042/
I can confirm this as well: clicking before the page can reload results in
double posts.