bug#44533: 27.1; Mac special key modifiers not functioning as expected

bug#44533: 27.1; Mac special key modifiers not functioning as expected

[YH Tan]

The functioning of certain special key modifiers doesn't seem to work as
expected in 27.1.

For example, when I do:

(setq mac-left-option-modifier 'nil)

nothing happens to the left option key, which retains its meta function. 

If I use: 

(setq mac-option-modifier 'nil)
(setq mac-right-option-modifier 'meta)

the left option key is revived, but the right option key fails to capture
some of the regular meta keybindings, such as org-do-promote/demote,
org-move-subtree-up/down etc. 

The error can be replicated with emacs -Q and evaluating the above
functions. 

-----

In GNU Emacs 27.1 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60 Version 10.14.6 (Build 18G95))
of 2020-08-12 built on builder10-14.porkrind.org
Windowing system distributor 'Apple', version 10.3.1671
System Description:  Mac OS X 10.14.6

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bug#44533: 27.1; Mac special key modifiers not functioning as expected

[Andrii Kolomoiets]

YH Tan <astyh83@gmail.com> writes:

> (setq mac-option-modifier 'nil)
> (setq mac-right-option-modifier 'meta)
>
> the left option key is revived, but the right option key fails to capture
> some of the regular meta keybindings, such as org-do-promote/demote,
> org-move-subtree-up/down etc. 

Is it possible that those keybindings are handled by your OS?

For example, I'm using following settings:

(custom-set-variables
 '(ns-command-modifier 'control)
 '(ns-right-command-modifier 'super))

When I press Command-TAB, Emacs doesn't "see" C-TAB (or s-TAB) because
Command-TAB is used by OS to switch to another application.

Use 'C-h k' to see what key is pressed and what command it invokes.

bug#44533: 27.1; Mac special key modifiers not functioning as expected

[Andrii Kolomoiets]

[Please keep debbugs email in the recipient list on reply]

YH Tan <astyh83@gmail.com> writes:

> option+up/down/left/right doesn’t do anything on its own in the system. 
>
> In org-mode ‘C-h k’ just ignores the meta key and returns the arrow or
> RET key (in the case of org-insert-heading). Only things like ‘M-x’
> works with the reset right option in this case.

I can't reproduce this in GNU Emacs 27.1 (build 1,
x86_64-apple-darwin18.7.0, NS appkit-1671.60 Version 10.14.6 (Build
18G95)):

emacs -Q
M-: (setq mac-option-modifier 'nil)
M-: (setq mac-right-option-modifier 'meta)
Now 'C-h k' describes up/down/left/right keys alone when I press them
with the left option key and M-up/down/left/right keys when I press them
with the right option key.

>> On Nov 10, 2020, at 04:14, Andrii Kolomoiets <andreyk.mad@gmail.com> wrote:
>> 
>> YH Tan <astyh83@gmail.com> writes:
>> 
>>> (setq mac-option-modifier 'nil)
>>> (setq mac-right-option-modifier 'meta)
>>> 
>>> the left option key is revived, but the right option key fails to capture
>>> some of the regular meta keybindings, such as org-do-promote/demote,
>>> org-move-subtree-up/down etc. 
>> 
>> Is it possible that those keybindings are handled by your OS?
>> 
>> For example, I'm using following settings:
>> 
>> (custom-set-variables
>> '(ns-command-modifier 'control)
>> '(ns-right-command-modifier 'super))
>> 
>> When I press Command-TAB, Emacs doesn't "see" C-TAB (or s-TAB) because
>> Command-TAB is used by OS to switch to another application.
>> 
>> Use 'C-h k' to see what key is pressed and what command it invokes.

bug#44533: 27.1; Mac special key modifiers not functioning as expected

[Alan Third]

On Mon, Nov 09, 2020 at 11:23:13PM +0800, YH Tan wrote:
> The functioning of certain special key modifiers doesn't seem to work as
> expected in 27.1.
> 
> For example, when I do:
> 
> (setq mac-left-option-modifier 'nil)
            ^^^^
> 
> nothing happens to the left option key, which retains its meta function. 

You should be using mac-option-modifier, not mac-left-option-modifier.

> If I use: 
> 
> (setq mac-option-modifier 'nil)
> (setq mac-right-option-modifier 'meta)
> 
> the left option key is revived, but the right option key fails to capture
> some of the regular meta keybindings, such as org-do-promote/demote,
> org-move-subtree-up/down etc. 
> 
> The error can be replicated with emacs -Q and evaluating the above
> functions. 

I can't replicate this.

> option+up/down/left/right doesn’t do anything on its own in the system.
>
> In org-mode ‘C-h k’ just ignores the meta key and returns the arrow or
> RET key (in the case of org-insert-heading). Only things like ‘M-x’
> works with the reset right option in this case.

This actually sounds suspiciously like you've remapped fn as option in
the system preferences. The fn key has some strange behaviours when
used with "control" keys like the arrows.

Do you have any other remapping set up? Are you using a USB keyboard?

-- 
Alan Third

bug#44533: 27.1; Mac special key modifiers not functioning as expected

[YH Tan]

> On Nov 10, 2020, at 19:11, Alan Third <alan@idiocy.org> wrote:
> 
> On Mon, Nov 09, 2020 at 11:23:13PM +0800, YH Tan wrote:
>> The functioning of certain special key modifiers doesn't seem to work as
>> expected in 27.1.
>> 
>> For example, when I do:
>> 
>> (setq mac-left-option-modifier 'nil)
>            ^^^^
>> 
>> nothing happens to the left option key, which retains its meta function. 
> 
> You should be using mac-option-modifier, not mac-left-option-modifier.

This would reset both option keys. I would like to retain meta on the right. 

> 
>> If I use: 
>> 
>> (setq mac-option-modifier 'nil)
>> (setq mac-right-option-modifier 'meta)
>> 
>> the left option key is revived, but the right option key fails to capture
>> some of the regular meta keybindings, such as org-do-promote/demote,
>> org-move-subtree-up/down etc. 
>> 
>> The error can be replicated with emacs -Q and evaluating the above
>> functions. 
> 
> I can't replicate this.
> 
>> option+up/down/left/right doesn’t do anything on its own in the system.
>> 
>> In org-mode ‘C-h k’ just ignores the meta key and returns the arrow or
>> RET key (in the case of org-insert-heading). Only things like ‘M-x’
>> works with the reset right option in this case.
> 
> This actually sounds suspiciously like you've remapped fn as option in
> the system preferences. The fn key has some strange behaviours when
> used with "control" keys like the arrows.
> 

Yes. I do have: 

(setq mac-function-modifier 'meta)

which maps function to meta. You mean this can actually interfere with the right-option meta key? 
I’ve been using the same setup for previous versions of emacs without problem. 

> Do you have any other remapping set up? Are you using a USB keyboard?
> 
> -- 
> Alan Third

bug#44533: 27.1; Mac special key modifiers not functioning as expected

[Alan Third]

[-- Attachment #1: Type: text/plain, Size: 1700 bytes --]

On Tue, Nov 10, 2020 at 08:09:03PM +0800, YH Tan wrote:
> 
> 
> > On Nov 10, 2020, at 19:11, Alan Third <alan@idiocy.org> wrote:
> > 
> > On Mon, Nov 09, 2020 at 11:23:13PM +0800, YH Tan wrote:
> >> The functioning of certain special key modifiers doesn't seem to work as
> >> expected in 27.1.
> >> 
> >> For example, when I do:
> >> 
> >> (setq mac-left-option-modifier 'nil)
> >            ^^^^
> >> 
> >> nothing happens to the left option key, which retains its meta function. 
> > 
> > You should be using mac-option-modifier, not mac-left-option-modifier.
> 
> This would reset both option keys. I would like to retain meta on the right. 

mac-left-option-modifier has no special function on the NS port of
Emacs. It may on the Mac port, but I don't think so. I recommend you
review the documentation (C-h i m emacs i ns-alternate-modifier).

> > This actually sounds suspiciously like you've remapped fn as option in
> > the system preferences. The fn key has some strange behaviours when
> > used with "control" keys like the arrows.
> > 
> 
> Yes. I do have: 
> 
> (setq mac-function-modifier 'meta)
> 
> which maps function to meta. You mean this can actually interfere
> with the right-option meta key? I’ve been using the same setup for
> previous versions of emacs without problem.

We reworked the keyboard handling for Emacs 27 because there were a
lot of strange behaviours.

I've attached a patch, it's for the master branch but is easily
adapted for Emacs 27.

Assuming this works I'd like to apply it to Emacs 27, but I'm not 100%
sure it won't break anything, so perhaps it's best to put it in master
first and back-port to Emacs 27 when/if we're happy with it.
-- 
Alan Third

[-- Attachment #2: 0001-Fix-error-with-fn-key-in-NS-port-bug-44533.patch --]
[-- Type: text/plain, Size: 2238 bytes --]

From 8c4ff510a580e2b66e6ed7e6e7f96fcf557429fc Mon Sep 17 00:00:00 2001
From: Alan Third <alan@idiocy.org>
Date: Tue, 10 Nov 2020 12:54:50 +0000
Subject: [PATCH] Fix error with fn key in NS port (bug#44533)

* src/nsterm.m ([EmacsView keyDown:]): Move the correction for fn key
handling to before the modifiers are calculated.
---
 src/nsterm.m | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/src/nsterm.m b/src/nsterm.m
index 4fad521b74..a9280eb4af 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -6531,6 +6531,14 @@ flag set (this is probably a bug in the OS).  */
             code = 0xFF08; /* backspace */
           else
             code = fnKeysym;
+
+          /* Function keys (such as the F-keys, arrow keys, etc.) set
+             modifiers as though the fn key has been pressed when it
+             hasn't.  Also some combinations of fn and a function key
+             return a different key than was pressed (e.g. fn-<left>
+             gives <home>).  We need to unset the fn key flag in these
+             cases.  */
+          flags &= ~NS_FUNCTION_KEY_MASK;
         }
 
       /* The ⌘ and ⌥ modifiers can be either shift-like (for alternate
@@ -6552,17 +6560,6 @@ In that case we use UCKeyTranslate (ns_get_shifted_character)
       Lisp_Object kind = fnKeysym ? QCfunction : QCordinary;
       emacs_event->modifiers = EV_MODIFIERS2 (flags, kind);
 
-      /* Function keys (such as the F-keys, arrow keys, etc.) set
-         modifiers as though the fn key has been pressed when it
-         hasn't.  Also some combinations of fn and a function key
-         return a different key than was pressed (e.g. fn-<left> gives
-         <home>).  We need to unset the fn modifier in these cases.
-         FIXME: Can we avoid setting it in the first place?  */
-      if (fnKeysym && (flags & NS_FUNCTION_KEY_MASK))
-        emacs_event->modifiers
-          ^= parse_solitary_modifier (mod_of_kind (ns_function_modifier,
-                                                   QCfunction));
-
       if (NS_KEYLOG)
         fprintf (stderr, "keyDown: code =%x\tfnKey =%x\tflags = %x\tmods = %x\n",
                  code, fnKeysym, flags, emacs_event->modifiers);
-- 
2.26.1

bug#44533: 27.1; Mac special key modifiers not functioning as expected

[Alan Third]

On Tue, Nov 10, 2020 at 01:11:44PM +0000, Alan Third wrote:
> I've attached a patch, it's for the master branch but is easily
> adapted for Emacs 27.
> 
> Assuming this works I'd like to apply it to Emacs 27, but I'm not 100%
> sure it won't break anything, so perhaps it's best to put it in master
> first and back-port to Emacs 27 when/if we're happy with it.

I've pushed this to master. I'll leave it a few weeks and decide
whether to push to Emacs 27.
-- 
Alan Third

bug#44533: 27.1; Mac special key modifiers not functioning as expected

[Alan Third]

On Fri, Nov 13, 2020 at 04:47:05PM +0000, Alan Third wrote:
> On Tue, Nov 10, 2020 at 01:11:44PM +0000, Alan Third wrote:
> > I've attached a patch, it's for the master branch but is easily
> > adapted for Emacs 27.
> > 
> > Assuming this works I'd like to apply it to Emacs 27, but I'm not 100%
> > sure it won't break anything, so perhaps it's best to put it in master
> > first and back-port to Emacs 27 when/if we're happy with it.
> 
> I've pushed this to master. I'll leave it a few weeks and decide
> whether to push to Emacs 27.

I've pushed the patch to Emacs 27 since it seems to be OK on master.
-- 
Alan Third