I've just upgraded to IntelliJ IDEA 10, and it has started doing something extremely annoying. While writing documentation in a .txt file it has started giving me word suggestions as I type. This is, instead of helping, just irritating me while also consuming system resources. I haven't been able to find a way to turn this off in the Settings window. Perhaps there's a way of telling Idea not to do this for certain file types or in code comments?
Cheers,
R
Goto Settings->Editor->Code Completion and untick Autopop code completion in (ms), or if you set this to something like 1000, then it give you time to carry on typing before poping up.
You are not alone, please watch/vote for IDEABKL-5963.
For intelliJ 2016.2.2, it defaults to auto insert code suggestions which is very annoying. Even when typing space, it overrides what I'm typing and puts something random in. Here's the solution:
Go to Settings > Editor > General > Code Completion
Then, UNCHECK the box that says "Insert selected variant by typing dot, space, etc." See screenshot below
来源：https://stackoverflow.com/questions/4985663/intellij-idea-10-how-to-turn-off-auto-complete-in-txt-files