bug#51974: 29.0.50; [PATCH] Fix deactivation of outline-minor-mode-cycle-map bindings

[miha--- via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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Lars Ingebrigtsen <larsi@gnus.org> writes:

> miha@kamnitnik.top writes:
>
>> -                                       'keymap outline-minor-mode-cycle-map)
>> +                                       'outline-cycle-keymap
>> +                                       outline-minor-mode-cycle-map)
>
> I'm not very enthusiastic about messing with char-property-alias-alist
> for something like this, but perhaps this is the best solution here?  I
> guess we don't have a mechanism to make a text property keymap "go away"
> when a minor mode is deactivated?

We have, it's called 'font-lock-extra-managed-props'. Using it, we can
do this in a simpler way:

diff --git a/lisp/outline.el b/lisp/outline.el
index a4d2a3b7d7..7f78c04866 100644
--- a/lisp/outline.el
+++ b/lisp/outline.el
@@ -427,6 +427,9 @@ outline-minor-mode
         (when (or outline-minor-mode-cycle outline-minor-mode-highlight)
           (if (and global-font-lock-mode (font-lock-specified-p major-mode))
               (progn
+                (when outline-minor-mode-cycle
+                  (add-to-list 'font-lock-extra-managed-props 'keymap
+                               nil #'eq))
                 (font-lock-add-keywords nil outline-font-lock-keywords t)
                 (font-lock-flush))
             (outline-minor-mode-highlight-buffer)))

This has a small disadvantage: deactivating outline-minor-mode will
remove all 'keymap' text properties from the whole buffer, even if they
are added by other minor or major modes or whatever. With
'char-property-alias-alist', we can create a sort of namespacing to
ensure that outline-minor-mode messes only with its own text properties.

'font-lock-mode' minor mode modifies 'char-property-alias-alist' in a
similar way for a similar reason.

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