running R under ESS inside emacs 21 prerelease

[Rich Heiberger]

Ah, with the more detailed description, it is the comint* problem that
you were seeing.  The way we know we have a prompt is to go to the beginning
of the line and look for the prompt (in the function
inferior-ess-wait-for-prompt in ess-inf.el).  With the new emacs 21 behavior,
the beginning-of-line function goes to the beginning of the user input
area, which is immediately after the prompt not before it.  Thus we never
see the prompt and you get the timeout message.  Turning off the new
behavior makes our procedure work again.

I initially installed this change in just essd-r.el.  It now looks like it
needs to be installed at least in all S language dialect files.

Rich
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