bug#25905: 25.1; Can't find regexp and replace in SVG files

[Juri Linkov]

> (defvar query-replace-overriding-mode-alist
>   '(("\\.svgz?\\'" . image-mode-as-text)
>     ("\\.x[bp]m\\'" . image-mode-as-text)
>     ("\\.p[bpgn]m\\'" . image-mode-as-text)))
>
> That would make this trivial to implement.  Comments?

Why only for query-replace?  Shouldn't isearch
display an image file as text for search too?
Maybe this should work like the option 'search-invisible'
when its value is 'open', i.e. to make the searched text
visible - in case of images this means displaying image
buffers as text for search/replace.