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The most likely mistakes people will make with the new command-line args are:
ipython -pdb # single leading '-' for flag, which requires '--'
and ipython --gui=foo # leading '-' on assignment
This commit adds a suggestion to the error message in these two cases for arguments that would otherwise be valid.
So
ipython --pylab=qt
will fail with:Invalid argument: '--pylab=qt'. Did you mean 'pylab=qt'?
etc.