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The keystroke Ctrl+[ don't work with Italian keyboard. the [ key on Italian Keyboard is the "é è [" ones, where for place a [ you must use Alt. Manually solved redefining the combination.
I understand it is annoying that non-US keyboards does not have [. If you want to use such shortcut you need to map it to existing key on your keyboard. I am sorry I don't see better solution, since I don't want to implement ad-hoc solution.