Re: Duplicated outline-cycle binding, and problems with the new one

[Stefan Monnier]

> But diff-mode overrides this binding with diff-mode-shared-map
> where the TAB key is bound to diff-hunk-next, since
> minor-mode-overriding-map-alist takes priority over
> minor-mode-map-alist when diff-mode does this:

I see.  I knew using `minor-mode-overriding-map-alist` in `diff-mode.el`
this way was going to bite us sooner or later.

Maybe we should use a hook on `read-only-mode` to set/unset
a `diff-mode-read-only` variable so we can add the keymap
(conditionalized on this new `diff-mode-read-only`) to
`minor-mode-map-alist` instead of `minor-mode-overriding-map-alist`.


        Stefan