Content Updates

Add Language Injection section that shows how the IntelliJ Platform handles different languages within the same source file.

IDE Infrastructure handles Logging, Error Reporting, Runtime Information, and how to provide Context Help.

Extension Point List now contains sections listing all provided Listener Topics. See also corresponding Extension Point Lists under Part VIII - Product Specific. Also, all deprecated API now has a dedicated tag.

Plugin Signing describes the plugin signing process, explains how to generate a certificate, configure the Gradle signPlugin task, and introduces a standalone CLI tool.

Testing FAQ page lists common issues, useful classes, and techniques for writing and maintaining tests.

Add Documentation section with an accompanying tutorial that show how to implement a DocumentationProvider for custom languages.

See Part VIII - Product Specific.

Add a new section Explore the IntelliJ Platform API that describes how plugin authors work with the IntelliJ Platform API and what tools they use.

Add a new section about Element Patterns that are used when implementing Completion Contributors or PSI Reference Contributors.

Add a new section about Text Selection EPs and describe ExtendWordSelectionHandler.

Added a code sample to the SDK tutorial that expands on assisting in the setup of an SDK.

Unified Abstract Syntax Tree (UAST) allows providing features that will work across all supported JVM languages (Java, Kotlin, Scala, Groovy).

Explore usages of Extension Points in open-source plugins using IntelliJ Platform Explorer.

All EPs available in IJ Platform and Android can now be browsed conveniently.

All code samples used in this guide now come with README, making it easier to browse them. They can be conveniently accessed via a separate GitHub repository.

Added new sections Code and Troubleshooting to Dynamic Plugins.

Create new plugins with a preconfigured project scaffold and CI in one click.

Added reference discussing resource cleanup/management.

Added guide and tutorial on integrating with IDE Settings dialog.

Inspect Swing components and associated data (like AnAction for menu item) using UI Inspector.

Allows embedding Chromium-based browser in the IDE.

All samples now use the recommended solution of setting up plugin projects.

The corresponding tutorial and Testing a Custom Language Plugin have been updated and enhanced as well.

Part VIII - Product Specific has been expanded massively, now also covering each IDE with its dedicated page.

Added starting point Dynamic Plugins for migrating plugins (IntelliJ Platform 2020.1 and later).

Components being a legacy feature, the updated page describes migrating them to modern replacement API.

All contents have been moved to JetBrains Marketplace documentation.

How to improve performance working with PSI, indexing, and avoiding UI freezes.

Describes preferred way of building UI/dialogs for IntelliJ Platform 2019.2 and later.