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Thanks to all for the quick responses. Some comments:

perhaps the breqn package could be of interest for you

Yes, indeed, thanks! I wasn't aware of that package and it seems to be in line with what I am looking for. It definitely looks worth trying it out.

I guess it shows one of the ...

Hi,

I was wondering if LaTeX could split long formulas automatically, based on invisible splitting points (or hints), in a way similar to hyphenation.

For example, assume you have a large equation that is likely to fit on one line but must be split into two parts if two columns are used. Or maybe ...

OK, I agree this isn't much of an issue.

I just wish to explain a little bit why I think it can be useful. Let us take for instance the HTML language or wiki text (when editing a page on Wikipedia). In these two examples, one can input an English text with Arabic words interleaved (or vice-versa ...

Hello Thorsten,

Thanks for your message.

Actually, this problem does not seem severe or have much consequences.

Anyway, here is a MWE as you suggest. After some testing, it appears when making the table of contents and when the hyperref package is used with option unicode=true . Hint: the number ...

Thanks a lot for your answer! This is indeed very helpful. :D

I was wondering if we could go a step further: have XeLaTeX detect automatically the Arabic text without having to type specific commands (and it would select the right font accordingly). Maybe this is asking for too much, but in HTML ...

Hello meho_r,

About the font selection when inputting Arabic text:

the second one solved

Actually, I am interested to know how you solved it. Can you help?

Thanks!

I have the same error message. It seems to happen when integrating the tables of content (maybe with the associated PDF bookmarks as you suggest) and it does not seem related to the actual text content or its encoding.