bug#814: 23.0.60; Fold case error in isearch / highlight-regexp

[Chong Yidong]

> If I start isearch and grab a word
>
>   C-s C-w
>
> and highlight this with
>
>   M-s o h r
>
> then if the word contains upper case letters there will be no highlight.
>
> This is on w32 with a fresh checkout, but using my patched version of
> Emacs (which I hope does not matter here).

I don't understand this recipe.  For instance, from the NEWS buffer,
`C-s C-w' grabs `GNU' into isearch, and `M-s o' displays a window
showing occurrences of that word in the buffer.  What is `h r' for?

Please provide a recipe recipe, thanks.