tilenable key repeat

In macOS, when you hold down a letter key you see a small popover with available alternates for that letter (for example by applying accents). This behavior can be disabled, returning to the previous behavior where holding a key repeats that letter until you release it.

To do so for a specific app:

defaults write com.googlecode.iterm2 ApplePressAndHoldEnabled -bool false

Or to disable system wide:

defaults write -g ApplePressAndHoldEnabled -bool false

After changing this setting, you need to restart the app or sign in session.

I learned this TIL recently from @rsms care of his excellent macOS Fixes doc.