Re: Modified keypad keys

[Juri Linkov <juri@jurta.org>]

>> Not sure about shift.  It's used to toggle the layout of the keypad
>> at the system level.  Also `shift-select-mode' comes into play.
>> So without adding `shift' to these remappings, when e.g.
>> `kp-7' self-inserts `7', `S-kp-7' selects the region
>> to the beginning of the line.
>
> I'm not sure I understand.  By `S-kp-7' do you mean "Emacs sees the
> event S-kp-7" or "I press the key 7 on the numeric keypad while pressing
> shift at the same time"?
> I can't see why Emacs would move to the beginning of line in response to
> the S-kp-7 event, unless you've added bindings on your own, but I can
> imagine that pressing that numeric-keypad-7 with shift might end up
> sending to Emacs some different event such as `S-home', which would
> behave like you describe.  If that's the case then adding shift among
> the modifiers in your code would simply not affect your case (but it
> would still be useful for other keyboards).

In the current trunk's `emacs -Q' when NumLock is off, `C-h k' for
pressing the key 7 on the numeric keypad displays:

  <home> (translated from <kp-home>) runs the command move-beginning-of-line

pressing the key 7 while pressing shift at the same time:

  7 (translated from <S-kp-7>) runs the command self-insert-command

When NumLock is on, pressing the key 7 on the numeric keypad:

  7 (translated from <kp-7>) runs the command self-insert-command

pressing the key 7 while pressing shift at the same time:

  <home> (translated from <S-kp-home>) runs the command move-beginning-of-line

and selects the region to the beginning of the line
when `shift-select-mode' is t.

`xev' displays for the key 7 when NumLock is off:

    state 0x0, keycode 79 (keysym 0xff95, KP_Home), same_screen YES,

and while pressing shift at the same time:

    state 0x1, keycode 79 (keysym 0xffb7, KP_7), same_screen YES,

When NumLock is on, `xev' displays for the key 7:

    state 0x110, keycode 79 (keysym 0xffb7, KP_7), same_screen YES,

and while pressing shift at the same time:

    state 0x11, keycode 79 (keysym 0xff95, KP_Home), same_screen YES,

In the trunk's bindings.el shift key bindings are commented out
with the following comment:

;; Don't bind shifted keypad numeric keys, they reportedly
;; interfere with the feature of some keyboards to produce
;; numbers when NumLock is off.
;(define-key function-key-map [S-kp-1] [S-end])
;(define-key function-key-map [S-kp-2] [S-down])
;(define-key function-key-map [S-kp-3] [S-next])
;(define-key function-key-map [S-kp-4] [S-left])
;(define-key function-key-map [S-kp-6] [S-right])
;(define-key function-key-map [S-kp-7] [S-home])
;(define-key function-key-map [S-kp-8] [S-up])
;(define-key function-key-map [S-kp-9] [S-prior])
(define-key function-key-map [C-S-kp-1] [C-S-end])
(define-key function-key-map [C-S-kp-2] [C-S-down])
(define-key function-key-map [C-S-kp-3] [C-S-next])
(define-key function-key-map [C-S-kp-4] [C-S-left])
(define-key function-key-map [C-S-kp-6] [C-S-right])
(define-key function-key-map [C-S-kp-7] [C-S-home])
(define-key function-key-map [C-S-kp-8] [C-S-up])
(define-key function-key-map [C-S-kp-9] [C-S-prior])

Perhaps the bottom part for C-S- should be commented out as well
for the same reason as explained in the comment above.

So the remaining controversial question is whether pressing
the key 7 while pressing shift at the same time when NumLock is on
should select the region or not.  There are equally good reasons
for both of these variants.