The latest version of IntelliJ has introduced a new type of hint in debug mode. It looks like:
Does anybody know how to disable it?
Also: does anybody know the term JetBrains uses for this feature? I can't look up the location of the setting in the setting search box without knowing what it's called!
You may switch it off by unchecking the "Predict future condition values…" option in "Preferences / Settings | Build, Execution, Deployment | Debugger | Data Views | Java"