Garbled font on autocomplete popup
Answered
After upgrading IntelliJ Ultimate to 2020.1 the text in autocomplete popup is garbled. Upgrade to 2020.1.1 didn't help. Changing UI or editor font doesn't help. Changing theme doesn't help either. Font on the screenshot is the default JetBrains Mono.

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Try to change antialiasing under Preferences | Appearance & Behavior | Appearance. Does it help?
Indeed it helps! I had to set IDE antialiasing to No antialiasing. 🤔