KTIJ-34800 IJPL-339 add kotlin support

Install the proper code insight context into kotlin class files.
Otherwise, these files don't satisfy the scopes of the modules and are ignored

GitOrigin-RevId: e48c0b3d12f93099525a2132947d3e47a2a78983

plugins/kotlin/base/analysis/src/org/jetbrains/kotlin/idea/base/analysis/IdeaDecompiledClassCustomization.kt

@@ -0,0 +1,35 @@
+// Copyright 2000-2025 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+package org.jetbrains.kotlin.idea.base.analysis
+
+import com.intellij.codeInsight.multiverse.CodeInsightContextManagerImpl
+import com.intellij.codeInsight.multiverse.codeInsightContext
+import com.intellij.codeInsight.multiverse.isSharedSourceSupportEnabled
+import com.intellij.psi.PsiFile
+import com.intellij.psi.impl.compiled.ClsFileImpl
+import org.jetbrains.kotlin.analysis.decompiled.light.classes.DecompiledClassCustomization
+import org.jetbrains.kotlin.psi.KtFile
+
+internal class IdeaDecompiledClassCustomization : DecompiledClassCustomization {
+    override fun customizeFakeClsFile(
+        fakeFile: ClsFileImpl,
+        originalKtFile: KtFile
+    ) {
+        fakeFile.installCodeInsightContextFrom(originalKtFile)
+    }
+
+    /**
+     * we need to install code insight context from the original [context] file so that [this] file has the same context.
+     * todo ijpl-339 ensure all light files are covered
+     */
+    private fun PsiFile.installCodeInsightContextFrom(
+        contextFile: KtFile
+    ) {
+        if (!isSharedSourceSupportEnabled(project)) {
+            return
+        }
+
+        val viewProvider = this.viewProvider
+        val codeInsightContextManager = CodeInsightContextManagerImpl.getInstanceImpl(project)
+        codeInsightContextManager.setCodeInsightContext(viewProvider, contextFile.codeInsightContext)
+    }
+}

plugins/kotlin/plugin/common/resources/META-INF/light-classes.xml

@@ -4,5 +4,9 @@
             serviceInterface="org.jetbrains.kotlin.asJava.classes.LightClassInheritanceHelper"
             serviceImplementation="org.jetbrains.kotlin.idea.caches.lightClasses.IdeLightClassInheritanceHelper"
     />
+    <applicationService
+            serviceInterface="org.jetbrains.kotlin.analysis.decompiled.light.classes.DecompiledClassCustomization"
+            serviceImplementation="org.jetbrains.kotlin.idea.base.analysis.IdeaDecompiledClassCustomization"
+    />
   </extensions>
 </idea-plugin>