Info-search should prompt with the previous search string being default

[Dan Jacobson]

Let's say you're in an info buffer, you type s, do a search, then type
s RET to do another search on the same string.  Well, it ought to at
least tell you that it plans to use the last string if you just type
RET; indeed, it might even be more courteous to put the string there
with the cursor at the end just in case you want to make minor
adjustments, but never mind that, M-p gets that, so how about just a
"(default: [last-string])" note?  otherwise one might think it behaves
like 'i' which goes to the index if you give it just RET...

emacs-version"20.7.1"
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