Make colours for lambda return hints similar to other hints (KT-30203)

Works for IntlliJ and Darcula themes but doesn't work with High Contrast

idea/src/org/jetbrains/kotlin/idea/parameterInfo/custom/ReturnHintLinePainter.kt

@@ -5,7 +5,10 @@
 
 package org.jetbrains.kotlin.idea.parameterInfo.custom
 
-import com.intellij.openapi.editor.*
+import com.intellij.openapi.editor.DefaultLanguageHighlighterColors
+import com.intellij.openapi.editor.EditorLinePainter
+import com.intellij.openapi.editor.LineExtensionInfo
+import com.intellij.openapi.editor.colors.EditorColorsManager
 import com.intellij.openapi.editor.markup.TextAttributes
 import com.intellij.openapi.fileEditor.FileDocumentManager
 import com.intellij.openapi.project.Project
@@ -14,6 +17,10 @@ import com.intellij.psi.PsiManager
 import org.jetbrains.kotlin.idea.KotlinLanguage
 
 class ReturnHintLinePainter : EditorLinePainter() {
+    companion object {
+        val SPACE_LINE_EXTENSION_INFO = LineExtensionInfo(" ", TextAttributes())
+    }
+
     override fun getLineExtensions(project: Project, file: VirtualFile, lineNumber: Int): List<LineExtensionInfo>? {
         val psiFile = PsiManager.getInstance(project).findFile(file) ?: return null
         if (psiFile.language != KotlinLanguage.INSTANCE) {
@@ -23,8 +30,11 @@ class ReturnHintLinePainter : EditorLinePainter() {
         val hint = getLineHint(project, file, lineNumber)
             ?: return null
 
-        val hintLineInfo = LineExtensionInfo(" $hint", TextAttributes())
+        val textAttributes =
-        return listOf(hintLineInfo)
+            EditorColorsManager.getInstance().globalScheme.getAttributes(DefaultLanguageHighlighterColors.INLINE_PARAMETER_HINT)
+        val hintLineInfo = LineExtensionInfo(hint, textAttributes)
+
+        return listOf(SPACE_LINE_EXTENSION_INFO, hintLineInfo)
     }
 
     private fun getLineHint(project: Project, file: VirtualFile, lineNumber: Int): String? {

idea/tests/org/jetbrains/kotlin/idea/parameterInfo/LambdaReturnValueHintsTest.kt

@@ -83,12 +83,12 @@ class LambdaReturnValueHintsTest : KotlinLightCodeInsightFixtureTestCase() {
         val actualText = run {
             val tags = ArrayList<TagsTestDataUtil.TagInfo<*>>()
 
-            tags.addAll(collectActualLineExtensionsTags())
-
             if (editor.caretModel.offset > 0) {
                 tags.add(CaretTag(editor))
             }
 
+            tags.addAll(collectActualLineExtensionsTags())
+
             TagsTestDataUtil.insertTagsInText(tags, editor.document.text)
         }
 
@@ -154,7 +154,7 @@ class LambdaReturnValueHintsTest : KotlinLightCodeInsightFixtureTestCase() {
             """
             val x = run {
                 println("foo")
-                1<caret><hint text=" ^run"/>
+                1<caret><hint text=" "/><hint text="^run"/>
             }
             """
         )
@@ -165,7 +165,7 @@ class LambdaReturnValueHintsTest : KotlinLightCodeInsightFixtureTestCase() {
             """
             val x = run {
                 var s = "abc"
-                s.length<caret><hint text=" ^run"/>
+                s.length<caret><hint text=" "/><hint text="^run"/>
             }
             """
         )
@@ -176,9 +176,9 @@ class LambdaReturnValueHintsTest : KotlinLightCodeInsightFixtureTestCase() {
             """
             val x = run {
                 if (true) {
-                    1<hint text=" ^run"/>
+                    1<hint text=" "/><hint text="^run"/>
                 } else {
-                    0<hint text=" ^run"/>
+                    0<hint text=" "/><hint text="^run"/>
                 }
             }
             """
@@ -190,7 +190,7 @@ class LambdaReturnValueHintsTest : KotlinLightCodeInsightFixtureTestCase() {
             """
             val x = run {
                 println(1)
-                if (true) 1 else { 0 }<caret><hint text=" ^run"/>
+                if (true) 1 else { 0 }<caret><hint text=" "/><hint text="^run"/>
             }
             """
         )
@@ -201,8 +201,8 @@ class LambdaReturnValueHintsTest : KotlinLightCodeInsightFixtureTestCase() {
             """
             val x = run {
                 when (true) {
-                    true -> 1<hint text=" ^run"/>
+                    true -> 1<hint text=" "/><hint text="^run"/>
-                    false ->0<hint text=" ^run"/>
+                    false -> 0<hint text=" "/><hint text="^run"/>
                 }
             }
             """
@@ -224,7 +224,7 @@ class LambdaReturnValueHintsTest : KotlinLightCodeInsightFixtureTestCase() {
             """
             val x = run foo@{
                 println("foo")
-                1<hint text=" ^foo"/>
+                1<hint text=" "/><hint text="^foo"/>
             }
             """
         )
@@ -239,10 +239,10 @@ class LambdaReturnValueHintsTest : KotlinLightCodeInsightFixtureTestCase() {
 
                 run { // Two hints here
                     when (true) {
-                        true -> 1<hint text=" ^run"/>
+                        true -> 1<hint text=" "/><hint text="^run"/>
-                        false -> 0<hint text=" ^run"/>
+                        false -> 0<hint text=" "/><hint text="^run"/>
                     }
-                }<hint text=" ^hello"/>
+                }<hint text=" "/><hint text="^hello"/>
             }
             """
         )
@@ -254,7 +254,7 @@ class LambdaReturnValueHintsTest : KotlinLightCodeInsightFixtureTestCase() {
             fun foo() {
                 run {
                     val length: Int? = null
-                    length ?: 0<hint text=" ^run"/>
+                    length ?: 0<hint text=" "/><hint text="^run"/>
                 }
             }
             """
@@ -268,12 +268,12 @@ class LambdaReturnValueHintsTest : KotlinLightCodeInsightFixtureTestCase() {
                 var test = 0
                 run {
                     test
-                    test++<hint text=" ^run"/>
+                    test++<hint text=" "/><hint text="^run"/>
                 }
 
                 run {
                     test
-                    ++test<hint text=" ^run"/>
+                    ++test<hint text=" "/><hint text="^run"/>
                 }
             }
             """
@@ -290,12 +290,12 @@ class LambdaReturnValueHintsTest : KotlinLightCodeInsightFixtureTestCase() {
                 run {
                     val files: Any? = null
                     @Some
-                    12<hint text=" ^run"/>
+                    12<hint text=" "/><hint text="^run"/>
                 }
 
                 run {
                     val files: Any? = null
-                    @Some 12<hint text=" ^run"/>
+                    @Some 12<hint text=" "/><hint text="^run"/>
                 }
             }
             """
@@ -309,12 +309,12 @@ class LambdaReturnValueHintsTest : KotlinLightCodeInsightFixtureTestCase() {
                 run {
                     val files: Any? = null
                     run@
-                    12<hint text=" ^run"/>
+                    12<hint text=" "/><hint text="^run"/>
                 }
 
                 run {
                     val files: Any? = null
-                    run@12<hint text=" ^run"/>
+                    run@12<hint text=" "/><hint text="^run"/>
                 }
             }
             """
@@ -326,7 +326,7 @@ class LambdaReturnValueHintsTest : KotlinLightCodeInsightFixtureTestCase() {
             """
             fun test() = run {
                 val a = 1
-                { a }<hint text=" ^run"/>
+                { a }<hint text=" "/><hint text="^run"/>
             }
             """
         )