IntelliJ IDEA Ultimate 2018.3 was a major update released by JetBrains that focused on streamlining the developer workflow through significant UI overhauls and improved tooling for version control and JVM languages.
: A long-requested feature that allowed developers to write multiline comments where all lines are correctly highlighted as TODOs. JetBrains IntelliJ IDEA Ultimate 2018.3
: Added inspections for "Constant conditions & exceptions" to help delete unreachable switch branches. It also introduced support for Kotlin in Spring MVC model variables. IntelliJ IDEA Ultimate 2018
: While highly stable, some users noted it remained resource-heavy compared to lighter editors, though the performance of the new asynchronous project tree helped reduce UI freezes. It also introduced support for Kotlin in Spring
: A new "Diff Preview" was added to the File History tab, allowing users to see code changes without opening a separate dialog.
: Users at the time praised the JetBrains update for making routine tasks like code navigation and repository updates "lightning quick".
What's new in IntelliJ IDEA 2018.3 EAP 5? - The JetBrains Blog