Spellchecker doesn't work in all latex files

I'm using latex and I have the problem that spellcheck works for main.tex,
but doesn't work for section1.tex, which is included by main.tex.

I'm not sure but I think the problem is that the spellchecker only works
between \begin{document} and \end{document}.

This wouldn't be problematic if I have a single latex file,
but for big latex projects it is common practice to split them
across files.

Personally I think it would be best if spell checking was enabled everywhere,
except inside a command. So \ref{ref} and \cite{citation},
begin{things} should be ignored
and everything else should be spell-checked.

-

By the way, I posted the same question a couple of weeks before, but I didn't
receive a response, so that's why I am asking this again.

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