Perhaps this is not possible. I just screwed up the grammar rules for about 30 minutes, and even if you ignore line breaks, it will not consider the text without ignoring on separate lines as continuous line breaks.
Effectively, what you are asking to do this is to cut out all lines from documents and compare two documents, as if each of them was only one (long) line of text. You can do this manually to detect changes, but you cannot merge the changes this way.
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