bug#10885: Replace expressions: enhance functionality when searching in filled paragraphs

[linuxfever]

Hello,

This is more of a suggestion/wish, rather than an actual bug, which could
enhance significantly replacement functionality in a filled text (region,
paragraph, buffer, etc).

Currently it seems that when trying to replace an expression comprising two
words, say for example 'replace this', then the functions 'replace-string'
or 'replace-regexp' fail to locate the expression when that is split along
two lines in the text, i.e., in the above example when the word 'replace' is
at the end of one line, and the word 'this' is at the beginning of the next
one.

I learned today
(http://old.nabble.com/Search-in-filled-text-does-not-work-correctly-td33390451.html#a33392628)
that there are ways around this by specifying a newline between words, for
example, searching for 'replace C-q C-j this' would actually do the work but
there are two problems with this. First, it is inefficient as it takes
longer to type, and second it would replace only the expressions that are
actually split in two lines and leave out the ones separated by a normal
SPC.

In a nutshell, I believe enhancing the functionality of the replacement
functions to accommodate for expressions split in two lines, would make
their usability so much easier. Thanks for your time and for such a great
and versatile editor!

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