Re: OS X: M-s and C-s modifiers generate weird keystrokes

[Philipp Stephani <p.stephani2@gmail.com>]

Pascal J. Bourguignon <pjb@informatimago.com> schrieb am Fri Feb 27 2015 at
09:00:21:

> Philipp Stephani <p.stephani2@gmail.com> writes:
>
> > I realized that on my OS X system (OS X 10.10.2, GNU Emacs 24.4.1
> > (x86_64-apple-darwin14.1.0, NS apple-appkit-1344.72)
> >  of 2015-02-23 on p) the key modifiers C, M, s, and C-M work as expected,
> > but C-s and M-s produce unexpected keys (according to the messages
> buffer):
> > C-s-a produces C-s-268632065, and M-s-a produces M-s-å. Is this expected,
> > or should I report a bug?
>
>
> How do you type s- on a MacOSX keyboard?
>
> I use a DasKeyboard 3 keyboard, with "System
> Preferences"/"Keyboard"/"Modifier Keys…" set to
>
>     Caps Lock ->  Control
>     Control   -> Control
>     Option    -> Command
>     Command   -> Option
>
> (there's no Hyper or super choice here);
>
> and consequently,  I get the following map to emacs
> (http://www.emacsformacosx.com) modifiers:
>
>
>     C-                      RET
>     S-                      S-
>     C- A- M- SPC M-a A- C-p C-
>
> (notice the C-p bound to the second form the right bottom key, which I
> cannot change to anything more useful).
>
>
>
I have a MS Natural ergonomic keyboard with Ctrl mapped to Cmd and Cmd
mapped to Ctrl in System Preferences. The keys on the bottom row are
labelled Ctrl, Windows, Alt, Space, Alt, Menu, Ctrl. OS X maps the first
three to Cmd, Option, Ctrl. With all the customization options in the "ns"
group in Emacs (from Homebrew) being set to their defaults, left and right
Cmd (that is, the keys labelled Ctrl for me) are mapped to Super, Option
(labelled Windows) is mapped to Meta, and Ctrl (labelled Alt) is mapped to
Ctrl. (Here it would be possible to also add mappings for Hyper and Alt.)
For the Option key Emacs seems to merge the bindings of OS X (Option+a = å)
and Emacs (Option = M), but only if the Super modifier is also pressed. No
idea what happens for Super+Ctrl.