MacOS – Disable auto suggest typing when using the CTRL key

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Sometimes when I press and release the CTRL key while my cursor is in a text field, the letter "I" gets inserted and an autosuggest list gets opened.

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I really really dislike this because I often press and release the CTRL key without wanting to type anything.

How can I disable this functionality?

Best Answer

As noted in another answer:

It's the auto completion from the built in spell checker and after a lengthy search I found the solution in Apples Discussion Forums:

defaults write -g NSUseSpellCheckerForCompletions -bool false

Afterwards restart affected programs and Esc just cancels searches again.

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