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Thank you for the comment - Alt+Shift changes the layout, and it seems for me that Sublime has its own mechanisms for layout of keyboard, but with similar shortcuts.

I got a pretty peculiar layout, though: quotation mark worked like tilde (as in you need to press it and then one more key - including tilde - to type it). I didn't have any idea what it was for, but then I tried to type "Arial", which resulted in a-umlaut.

In my language we don't use those!