bug#2145: 23.0.90; S-SPC should scroll up in view-only buffers

[Glenn Morris]

Juri Linkov wrote:

> To do the same for gnus messages is possible with:
>
> (define-key gnus-summary-mode-map [?\S-\ ] 'gnus-summary-prev-page)
> (define-key gnus-article-mode-map [?\S-\ ] 'gnus-article-goto-prev-page)
>
> And this is also useful for images:
>
> (define-key image-mode-map [?\S-\ ] 'image-scroll-down)
> (define-key doc-view-mode-map [?\S-\ ] 'doc-view-scroll-down-or-previous-page)

Please add them then.