Gray background between words when paste content in Writer

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Why LiberOffice is doing this? Do you have a reasonable explanation for this behavior?
Where can I find the Writer PDF manual ?
I haven't found that document. I honestly have no idea of what is the meaning of "Formatting Aid" and there is not a single line of explanation in that window. Anyway unchecking the "Non-breaking space" checkbox is the solution for this problem.

Thank you.

Alex

You can download the PDF manual from the LibreOffice.org Get Help/Documentation Page. The manuals are still catching up with LO 5, so you you should find the Writer manual under “4.x guides”. But you might want to download the “Getting Started” manual as well. This does have an LO 5 edition.

Like any other well-behaved word-processor LO gives you the choice of seeing where a formatting aid is doing something something behind the scenes. The non-breaking space will be there because the author put it there. I prefer to see that it is there because copied text often has this connection where I might might not want it. But the choice is yours.

I disagree with you a little. Let me explain.
Other word processor (MS Word) just fill the copied text in the document, without the fancy "gray squares". That is what probably 99.9% of the users want.
A well-behaved word-processor should provide the functionality to enable the visibility/highlight of that NBSP but that should not be enabled by default in my opinion.
My point is that this nice advanced feature should not be an "issue" for common users. But is nice to have.

The author (the original HTML document) does not have set any NBSP before that link. It has a simple space and can go on new line if required.
LO formatting aid put the NBSP also after the HTML anchor. I think it is converting the new-line character in paragraph to NBSP. Its reasonable but it can results in a "dirty" document sometime (there many NBSB everywhere, often non-sense).
I really appreciate your explanation. Thank you.