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bug#25091: 26.0.50; shr-map hides gnus-article keys

From: Katsumi Yamaoka
Subject: bug#25091: 26.0.50; shr-map hides gnus-article keys
Date: Mon, 05 Dec 2016 15:57:12 +0900
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (i686-pc-cygwin)

On Fri, 02 Dec 2016 21:26:20 -0500, address@hidden wrote:
> There's a similar attempt in yasnippet to try use the original binding.
> It's generally been troublesome.

I realized it is not a coincidence that two TAB commands, one is
provided by `gnus-article-mode-map' and the other is provided by
`shr-map', behave similarly in the Gnus article buffer.  Why TAB
-- `widget-forward' -- moves the point to a shr link in addition
to attachment buttons is because Gnus adds widget buttons to shr
links purposely using `mm-convert-shr-links' (see mm-decode.el).
So, I believe it is natural to make `shr-next-link' behave like
`widget-forward' as well.  Furthermore, what should make it do so
should be `mm-convert-shr-links', not shr functions (as a patch
I posted first).  In other words, the command that TAB invokes
on a widget button added to a shr link should be `widget-forward',
not `shr-next-link'.

,---- background
| Normally TAB in the Gnus article buffer runs `widget-forward'
| that moves point to the next attachment button or a shr link.
| However, TAB on a shr link in the Gnus article buffer runs
| `shr-next-link' that moves point to only the next shr link.
| So is `shr-previous-link'.

A new patch is below.

> I'm planning to switch it to use a conditional binding as described at [1].

> (define-key <map> <key>
>   `(menu-item "" <my-cmd> :filter ,(lambda (cmd) (if <my-predicate> cmd))))

> [1]: 
> http://stackoverflow.com/questions/16090517/elisp-conditionally-change-keybinding/22863701#22863701

Thanks.  But this case seems to not necessarily be related.

--- mm-decode.el~       2016-07-25 23:45:06.237009600 +0000
+++ mm-decode.el        2016-12-05 06:55:13.007620000 +0000
@@ -1859,6 +1859,10 @@
        (dolist (key (where-is-internal #'widget-button-click widget-keymap))
          (unless (lookup-key keymap key)
            (define-key keymap key #'ignore)))
+       ;; Avoid `shr-next-link' and `shr-previous-link' so as to run
+       ;; `widget-forward' and `widget-backward' instead.
+       (substitute-key-definition 'shr-next-link nil keymap)
+       (substitute-key-definition 'shr-previous-link nil keymap)
        (dolist (overlay (overlays-at start))
          (overlay-put overlay 'face nil))
        (setq start end)))))

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