Create actual: add delegation to secondary constructor, if needed

#KT-26518 Fixed

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRenderer.kt

@@ -187,6 +187,7 @@ interface DescriptorRendererOptions {
     var normalizedVisibilities: Boolean
     var renderDefaultVisibility: Boolean
     var renderDefaultModality: Boolean
+    var renderConstructorDelegation: Boolean
     var renderActualAnnotationPropertiesInPrimaryConstructor: Boolean
     var uninferredTypeParameterAsName: Boolean
     var overrideRenderingPolicy: OverrideRenderingPolicy

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererImpl.kt

@@ -725,8 +725,8 @@ internal class DescriptorRendererImpl(
         if (renderConstructorKeyword) {
             builder.append(renderKeyword("constructor"))
         }
+        val classDescriptor = constructor.containingDeclaration
         if (secondaryConstructorsAsPrimary) {
-            val classDescriptor = constructor.containingDeclaration
             if (renderConstructorKeyword) {
                 builder.append(" ")
             }
@@ -736,6 +736,19 @@ internal class DescriptorRendererImpl(
 
         renderValueParameters(constructor.valueParameters, constructor.hasSynthesizedParameterNames(), builder)
 
+        if (renderConstructorDelegation && !constructor.isPrimary && classDescriptor is ClassDescriptor) {
+            val primaryConstructor = classDescriptor.unsubstitutedPrimaryConstructor
+            if (primaryConstructor != null) {
+                val parametersWithoutDefault = primaryConstructor.valueParameters.filter {
+                    !it.declaresDefaultValue() && it.varargElementType == null
+                }
+                if (parametersWithoutDefault.isNotEmpty()) {
+                    builder.append(" : ").append(renderKeyword("this"))
+                    builder.append(parametersWithoutDefault.joinToString(prefix = "(", postfix = ")", separator = ", ") { "" })
+                }
+            }
+        }
+
         if (secondaryConstructorsAsPrimary) {
             renderWhereSuffix(constructor.typeParameters, builder)
         }

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererOptionsImpl.kt

@@ -18,7 +18,6 @@ package org.jetbrains.kotlin.renderer
 
 import org.jetbrains.kotlin.descriptors.ValueParameterDescriptor
 import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
-import org.jetbrains.kotlin.descriptors.annotations.AnnotationWithTarget
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.types.KotlinType
 import java.lang.IllegalStateException
@@ -82,6 +81,7 @@ internal class DescriptorRendererOptionsImpl : DescriptorRendererOptions {
     override var normalizedVisibilities by property(false)
     override var renderDefaultVisibility by property(true)
     override var renderDefaultModality by property(true)
+    override var renderConstructorDelegation by property(false)
     override var renderActualAnnotationPropertiesInPrimaryConstructor by property(false)
     override var uninferredTypeParameterAsName by property(false)
     override var includePropertyConstant by property(false)