[ESS] Debug mode puts point in the wrong buffer

Vitalie Spinu spinuvit at gmail.com
Thu Jun 20 10:33:20 CEST 2013

 >> Marius Hofert <marius.hofert at math.ethz.ch>
 >> on Wed, 19 Jun 2013 23:55:10 +0200 wrote:


 > 1) ... M-C and means M-S-c (although this can never be clear since the
 > keys on a keybard are already shown as uppercase letters whereas they
 > are lowercase if not pressed with shift... but okay). Why not write
 > M-S-c? at least it's then clear that M-C does *not* mean 'meta +
 > control'.

 > 2) ... C-M-S-c for 'cont-multi' ... here, the 'Shift' is denoted by
 > 'S', probably to avoid the confusion with C-M-C, where the first 'C'
 > is 'Control' and the second 'C'.

The keys are generated automatically. This is how emacs writes them. By
convention C always precedes M, so M-C cannot mean Alt+Control, which
are meaningless anyways.

 > Okay, I now got it to work, but only because I put the point back in
 > the *R* buffer... that's exactly the behavior I don't understand. Why
 > do I always have to switch in the other buffer (back go *R*) first
 > before I can enter debug commands (be it either RET or M-N [indeed,
 > RET is even simpler in this case :-)]).

It should work from the R script buffer. Unless that script buffer is
not associated with the process. It looks like a bug to me. 

Can you try the following. Create a new test.R and put the following
into it:

   foo <- function(){
       1 + 2

Evaluate the function with C-c C-c. Then foo(). Do you see visual
debugger jumping and highlighting the line 1+2?

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Now M-N (from test.R) should advance the debugger to exit.


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