bug#13402: 24.2.92 pretest: bugs in isearch-yank-line in info page

[Juri Linkov <juri@jurta.org>]

> I think it should either skip it properly, or not at all.  There is an
> inconsistency here between parts of isearch.

This can be fixed by the patch below that takes into account
the default value `open' of `search-invisible' and treats it the same
as its value `t', i.e. matches hidden text (but it still can't "open" it
in a meaningful way).

> C-s C-w also produces these error messages, and the "[end of node]"
> is just wierd, from a user's point of view.

I have no idea for a better error message.

> I think this should be fixed, somehow, for Emacs 24.3.  I would agree
> with your suggestion that isearch should simply yank the invisible text.

This is not a regression, so this patch is intended for trunk:

=== modified file 'lisp/info.el'
--- lisp/info.el	2013-02-12 07:57:04 +0000
+++ lisp/info.el	2013-02-13 17:52:53 +0000
@@ -2162,7 +2162,7 @@ (defun Info-isearch-filter (beg-found fo
     (let ((backward (< found beg-found)))
       (not
        (or
-	(and (not (eq search-invisible t))
+	(and (null search-invisible)
 	     (if backward
 		 (or (text-property-not-all found beg-found 'invisible nil)
 		     (text-property-not-all found beg-found 'display nil))