[bug] [babel] babel corrupts undo history

[Samuel Wales <samologist@gmail.com>]

c-c ' c-c ' on this.  then undo or undo-tree-undo.

what happens is data corruption.  to me, undo is a low-level
operation that should always work, even with a syntactically
invalid block.

a relevant variable is org-src-preserve-indentation.  it is
possible to change it without changing a block.

===

#+BEGIN_SRC sh :noweb yes :results verbatim output
  (
      cat <<EOF
test
EOF
  ) 2>&1
  :
#+END_SRC

===

Emacs 24.2, recent Org, recent undo-tree-mode.

Thanks.

Samuel

P.S.  You might be wondering why I use a subshell and a
redirection followed by a null command.  This is because I
prefer to bypass Babel's error mechanism, which I find
confusing.  Doing exactly as above is the only way I know to
get Babel to work the way I prefer (although {} might or
might not work also).  I always do this for every block.  IMO it would
be great for newcomers if there were options in Babel sh blocks for
exactly this.

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