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Open a Terminal window and run defaults write -g ApplePressAndHoldEnabled -bool false . Some programs will reflect the new setting immediately, but you may need to restart programs like Slack in order to get them to load the setting.
In an app on your Mac, press and hold a key on the keyboard—for example, a—to display the accent menu. The menu isn't shown if a key doesn't have any possible accent marks. Select a character in the menu—for example, á.
Enter special characters and symbols You can use the Character Viewer to add special characters and symbols to text, such as math symbols, Latin characters, and pictographs. Click in the text where you want to place the character, then choose Edit > Emoji & Symbols (or press Control-Command-Space bar).
Yes! It's a shame that I didn't know about such a simple thing - but this is because I'm not a mac-maniac, I live on several OSes at once. When I've found out that quote + symbol gives me an accented character I've realized what's happening.
This was very easy:
This 'U.S. International' did all the evil. Some IDE use their own input system, while Eclipse uses common input. This feature is one of those 'little convenient things' (just like smart quotes) which turn my life on mac into nightmare sometimes.
If you are looking to disable auto accents for languages other than U.S. English, I made a workaround solution here: How to prevent the typing of special characters like "~" modifying the next keyboard input?
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