Vim spontaneously switch to tabs from spaces for indents

Hey guys!

Sometimes, when i edit ruby code(i haven't noticed this problem with another file types), vim gets confused and start using tabs instead of spaces for indents. It can happen multiple times per hour and although it can be fixed with :set expandtab, it's extremely annoying.

I have no idea how to debug this. Can anyone point me in a right direction?

configuration i'm using: https://github.com/dredozubov/dotvim

Denis Redozubov

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