Notable Changes in IntelliJ Platform and Plugins API 2021.*

Early Access Program (EAP) releases of upcoming versions are available here.

2021.3

External code formatter tools API: Allows integration of standalone tools like shfmt: External Code Formatter.
Simplified API for CustomComponentAction: Use new method updateCustomComponent(Component, Presentation) to synchronize given Presentation and component state.

Unit test mode: non-production IconManager: Now com.intellij.ui.IconManager.createDeferredIcon() doesn't use iconProducer which might result in "wrong" composite icons and failed assertions. Override UsefulTestCase.isIconRequired() returning true to restore production icons. Alternatively, invoke Registry.get("psi.deferIconLoading").setValue(false) in setUp() and Registry.get("psi.deferIconLoading").resetToDefault() in tearDown().
Constructor Injection disabled for Extensions: Please obtain necessary components only when needed (logged as ERROR now).
Language Injection: Use LanguageInjectionContributor (EP com.intellij.languageInjectionContributor) and LanguageInjectionPerformer (EP com.intellij.languageInjectionPerformer) to customize language injection.

Unbundled plugins: Several plugins (Arquillian, AspectJ, CoffeeScript, Debugger Support for JSP (JSR45), Drools, Guice, Helidon, Java EE: Enterprise Java Beans (EJB), Spring OSGi, Spring Web Flow) have been unbundled. The IDE will suggest installation if the project contains related framework dependency. If your plugin depends on them, users will need to install them from the JetBrains Plugins Repository.

Add unambiguous imports on the fly for custom languages: Override ReferenceImporter#isAddUnambiguousImportsOnTheFlyEnabled() and provide corresponding user setting. Implement HintAction with fixSilently() and hook it up to highlighting as a quick fix for unresolved reference.
Ability to override encoding per VirtualFile: Implement FileEncodingProvider and register in com.intellij.fileEncodingProvider extension point.
JCEF: wrapper for CefBrowser: JBCefOsrHandlerBrowser forwards to custom CefRenderHandler, e.g., for off-screen rendering.

Testframework: JUnit4 variant for LightJavaCodeInsightFixtureTestCase: Use com.intellij.testFramework.fixtures.LightJavaCodeInsightFixtureTestCase4.

Last modified: 06 October 2021