[racket-dev] try the GRacket2 branch

Hi,

In a build from a checkout of a few minutes ago, drracket dies on me
when i try to resize its window, with the following message to the
console:

The program '<unknown>' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
  (Details: serial 4084 error_code 8 request_code 59 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error()
   function.)

I've tried to pass --sync to drracket, but it complains that the flag is
not recognized.

This is on a debian unstable box with gtk 2.20.1.

Cheers,
jao