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Notable Changes in IntelliJ Platform and Plugins API 2021.*

2021.2

Notable Changes in IntelliJ Platform 2021.2

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).

2021.1

Notable Changes in IntelliJ Platform 2021.1

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.

Notable Changes in Java Plugin 2021.1

Testframework: JUnit4 variant for LightJavaCodeInsightFixtureTestCase
Use com.intellij.testFramework.fixtures.LightJavaCodeInsightFixtureTestCase4.
Last modified: 21 April 2021