Misc: Improve IDE rendering of type aliases

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

@@ -36,6 +36,7 @@ import org.jetbrains.kotlin.serialization.deserialization.NotFoundClasses
 import org.jetbrains.kotlin.types.*
 import org.jetbrains.kotlin.types.ErrorUtils.UninferredParameterTypeConstructor
 import org.jetbrains.kotlin.types.TypeUtils.CANT_INFER_FUNCTION_PARAM_TYPE
+import java.lang.UnsupportedOperationException
 import java.util.*
 
 internal class DescriptorRendererImpl(
@@ -128,9 +129,7 @@ internal class DescriptorRendererImpl(
             // TODO nullability is lost for abbreviated type?
             renderNormalizedTypeAsIs(abbreviated.abbreviation)
             if (renderUnabbreviatedType) {
-                append(" /* = ")
+                renderAbbreviatedTypeExpansion(abbreviated)
-                renderNormalizedTypeAsIs(abbreviated.expandedType)
-                append(" */")
             }
             return
         }
@@ -138,6 +137,18 @@ internal class DescriptorRendererImpl(
         renderNormalizedTypeAsIs(type)
     }
 
+    private fun StringBuilder.renderAbbreviatedTypeExpansion(abbreviated: AbbreviatedType) {
+        if (textFormat == RenderingFormat.HTML) {
+            append("<font color=\"808080\"><i>")
+        }
+        append(" /* = ")
+        renderNormalizedTypeAsIs(abbreviated.expandedType)
+        append(" */")
+        if (textFormat == RenderingFormat.HTML) {
+            append("</i></font>")
+        }
+    }
+
     private fun StringBuilder.renderNormalizedTypeAsIs(type: KotlinType) {
         if (type is WrappedType && debugMode && !type.isComputed()) {
             append("<Not computed yet>")

idea/ide-common/src/org/jetbrains/kotlin/idea/util/IdeDescriptorRenderers.kt

@@ -51,6 +51,7 @@ object IdeDescriptorRenderers {
         overrideRenderingPolicy = OverrideRenderingPolicy.RENDER_OVERRIDE
         unitReturnType = false
         modifiers = DescriptorRendererModifier.ALL
+        renderUnabbreviatedType = false
     }
 
     @JvmField val SOURCE_CODE: DescriptorRenderer = BASE.withOptions {

idea/src/org/jetbrains/kotlin/idea/parameterInfo/KotlinFunctionParameterInfoHandler.kt

@@ -233,6 +233,10 @@ abstract class KotlinParameterInfoWithCallHandlerBase<TArgumentList : KtElement,
     override fun getParametersForLookup(item: LookupElement, context: ParameterInfoContext) = emptyArray<Any>()
     override fun getParametersForDocumentation(item: FunctionDescriptor, context: ParameterInfoContext) = emptyArray<Any>()
 
+    private val RENDERER = DescriptorRenderer.SHORT_NAMES_IN_TYPES.withOptions {
+        renderUnabbreviatedType = false
+    }
+
     private fun renderParameter(parameter: ValueParameterDescriptor, includeName: Boolean, named: Boolean, project: Project): String {
         return buildString {
             if (named) append("[")
@@ -246,7 +250,7 @@ abstract class KotlinParameterInfoWithCallHandlerBase<TArgumentList : KtElement,
                 append(": ")
             }
 
-            append(DescriptorRenderer.SHORT_NAMES_IN_TYPES.renderType(parameterTypeToRender(parameter)))
+            append(RENDERER.renderType(parameterTypeToRender(parameter)))
 
             if (parameter.hasDefaultValue()) {
                 append(" = ")