[ESS] disabling C-c h bound to ess-handy-commands

[Stephen Eglen]

> C-c C-<letter> is okay.
> C-c <letter> is reserved for users.

Sam's right; I think we should stay away from C-c LETTER; see the info
node below.

Stephen




File: elisp,  Node: Key Binding Conventions,  Next: Programming Tips,  Prev: Coding Conventions,  Up: Tips

D.2 Key Binding Conventions
===========================

   * Many special major modes, like Dired, Info, Compilation, and Occur,
     are designed to handle read-only text that contains "hyper-links".
     Such a major mode should redefine `mouse-2' and <RET> to follow
     the links.  It should also set up a `follow-link' condition, so
     that the link obeys `mouse-1-click-follows-link'.  *Note Clickable
     Text::.  *Note Buttons::, for an easy method of implementing such
     clickable links.

   * Don't define `C-c LETTER' as a key in Lisp programs.  Sequences
     consisting of `C-c' and a letter (either upper or lower case) are
     reserved for users; they are the *only* sequences reserved for
     users, so do not block them.

     Changing all the Emacs major modes to respect this convention was a
     lot of work; abandoning this convention would make that work go to
     waste, and inconvenience users.  Please comply with it.

   * Function keys <F5> through <F9> without modifier keys are also
     reserved for users to define.

   * Sequences consisting of `C-c' followed by a control character or a
     digit are reserved for major modes.

   * Sequences consisting of `C-c' followed by `{', `}', `<', `>', `:'
     or `;' are also reserved for major modes.

   * Sequences consisting of `C-c' followed by any other punctuation
     character are allocated for minor modes.  Using them in a major
     mode is not absolutely prohibited, but if you do that, the major
     mode binding may be shadowed from time to time by minor modes.

   * Don't bind `C-h' following any prefix character (including `C-c').
     If you don't bind `C-h', it is automatically available as a help
     character for listing the subcommands of the prefix character.