KtLightAnnotation: handling vararg with single arg (EA-114679)

It is deprecated but yet possible form of usage

compiler/light-classes/src/org/jetbrains/kotlin/asJava/elements/lightAnnotations.kt

@@ -194,15 +194,20 @@ class KtLightAnnotationForSourceEntry(
             delegate.initializers.mapIndexed { i, memberValue ->
                 wrapAnnotationValue(memberValue, this, {
                     originalExpression.let { ktOrigin ->
-                        when (ktOrigin) {
+                        when {
-                            is KtValueArgumentList -> ktOrigin.arguments.getOrNull(i)?.getArgumentExpression()
+                            ktOrigin is KtValueArgumentList -> ktOrigin.arguments.getOrNull(i)?.getArgumentExpression()
-                            is KtCallElement -> ktOrigin.valueArguments.getOrNull(i)?.getArgumentExpression()
+                            ktOrigin is KtCallElement -> ktOrigin.valueArguments.getOrNull(i)?.getArgumentExpression()
-                            is KtCollectionLiteralExpression -> ktOrigin.getInnerExpressions().getOrNull(i)
+                            ktOrigin is KtCollectionLiteralExpression -> ktOrigin.getInnerExpressions().getOrNull(i)
+                            delegate.initializers.size == 1 -> ktOrigin
                             else -> null
                         }.also {
                             if (it == null)
                                 LOG.error("error wrapping ${memberValue.javaClass} for ${ktOrigin?.javaClass} in ${ktOrigin?.containingFile}",
-                                          Attachment("source_fragments.txt", "origin: '${psiReport(ktOrigin)}', delegate: ${psiReport(delegate)}"))
+                                          Attachment(
+                                              "source_fragments.txt",
+                                              "origin: '${psiReport(ktOrigin)}', delegate: ${psiReport(delegate)}, parent: ${psiReport(parent)}"
+                                          )
+                                )
                         }
                     }
                 })

idea/tests/org/jetbrains/kotlin/asJava/KtLightAnnotationTest.kt

@@ -339,6 +339,27 @@ class KtLightAnnotationTest : KotlinLightCodeInsightFixtureTestCase() {
         }
     }
 
+    fun testVarargWithSingleArg() {
+        myFixture.addClass("""
+            public @interface Annotation {
+                String[] value();
+            }
+        """.trimIndent())
+
+        myFixture.configureByText("AnnotatedClass.kt", """
+            @Annotation(value = "a")
+            open class AnnotatedClass
+        """.trimIndent())
+        myFixture.testHighlighting("Annotation.java", "AnnotatedClass.kt")
+
+        val annotations = myFixture.findClass("AnnotatedClass").expectAnnotations(1)
+        val annotationAttributeVal = annotations.first().findAttributeValue("value") as PsiArrayInitializerMemberValue
+        assertTextAndRange("\"a\"", annotationAttributeVal)
+        for ((i, arg) in listOf("\"a\"").withIndex()) {
+            assertTextAndRange(arg, annotationAttributeVal.initializers[i])
+        }
+    }
+
     fun testVarargWithArrayLiteralAndSpread() {
         myFixture.addClass("""
             public @interface Annotation {