Navigation to binaries: support navigation to type alias constructors

#KT-13479 Fixed

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/TypeAliasConstructorDescriptor.kt

@@ -26,6 +26,7 @@ import org.jetbrains.kotlin.types.Variance
 
 interface TypeAliasConstructorDescriptor : ConstructorDescriptor {
     val underlyingConstructorDescriptor: ClassConstructorDescriptor
+    val typeAliasDescriptor: TypeAliasDescriptor
 
     override fun getContainingDeclaration(): TypeAliasDescriptor
 
@@ -45,7 +46,7 @@ interface TypeAliasConstructorDescriptor : ConstructorDescriptor {
 }
 
 class TypeAliasConstructorDescriptorImpl private constructor(
-        val typeAliasDescriptor: TypeAliasDescriptor,
+        override val typeAliasDescriptor: TypeAliasDescriptor,
         override val underlyingConstructorDescriptor: ClassConstructorDescriptor,
         original: TypeAliasConstructorDescriptor?,
         annotations: Annotations,

idea/idea-analysis/src/org/jetbrains/kotlin/idea/decompiler/navigation/findDecompiledDeclaration.kt

@@ -20,6 +20,7 @@ import com.intellij.openapi.project.Project
 import com.intellij.psi.search.EverythingGlobalScope
 import org.jetbrains.kotlin.builtins.DefaultBuiltIns
 import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.descriptors.impl.TypeAliasConstructorDescriptor
 import org.jetbrains.kotlin.idea.decompiler.KtDecompiledFile
 import org.jetbrains.kotlin.idea.decompiler.textBuilder.DecompiledTextIndexer
 import org.jetbrains.kotlin.idea.stubindex.*
@@ -81,6 +82,7 @@ private fun findCandidateDeclarationsInIndex(
     }
 
     val topLevelDeclaration = DescriptorUtils.getParentOfType(referencedDescriptor, PropertyDescriptor::class.java, false)
+                              ?: DescriptorUtils.getParentOfType(referencedDescriptor, TypeAliasConstructorDescriptor::class.java, false)?.typeAliasDescriptor
                               ?: DescriptorUtils.getParentOfType(referencedDescriptor, FunctionDescriptor::class.java, false)
                               ?: DescriptorUtils.getParentOfType(referencedDescriptor, TypeAliasDescriptor::class.java, false)
                               ?: return emptyList()
@@ -109,6 +111,10 @@ object ByDescriptorIndexer : DecompiledTextIndexer<String> {
     internal fun getDeclarationForDescriptor(descriptor: DeclarationDescriptor, file: KtDecompiledFile): KtDeclaration? {
         val original = descriptor.original
 
+        if (original is TypeAliasConstructorDescriptor) {
+            return getDeclarationForDescriptor(original.typeAliasDescriptor, file)
+        }
+
         if (original is ValueParameterDescriptor) {
             val callable = original.containingDeclaration
             val callableDeclaration = getDeclarationForDescriptor(callable, file) as? KtCallableDeclaration ?: return null

idea/testData/decompiler/navigation/usercode/TypeAlias.decompiled.expected

@@ -1,2 +1,2 @@
  MainKt.class
-public typealias <1>SimpleClassAlias = testData.libraries.SimpleClass
+public typealias <1><2>SimpleClassAlias = testData.libraries.SimpleClass

idea/testData/decompiler/navigation/usercode/TypeAlias.kt

@@ -1,4 +1,5 @@
 import testData.libraries.*
 
 fun foo(c: SimpleClassAlias) {
+    val s = SimpleClassAlias()
 }

idea/testData/decompiler/navigation/usercode/TypeAlias.source.expected

@@ -1,2 +1,2 @@
  main.kt
-typealias <1>SimpleClassAlias = SimpleClass
+typealias <1><2>SimpleClassAlias = SimpleClass