KT-32368 Rework Inline hints settings // preview text

idea/src/org/jetbrains/kotlin/idea/codeInsight/hints/KotlinInlayParameterHintsProvider.kt

@@ -28,6 +28,19 @@ class KotlinInlayParameterHintsProvider : InlayParameterHintsProvider {
             "*SequenceBuilder.resume(value)", "*SequenceBuilder.yield(value)"
         )
 
+    override fun getSettingsPreview(): String {
+        return """
+            fun callsAnotherFun() {
+                anotherFunction(1, 2)            
+            }
+            
+            fun anotherFunction(a: Int = 10, b: Int = 5): Int {
+                val sum = a + b
+                return sum * 2
+            } 
+        """.trimIndent()
+    }
+
     override fun getHintInfo(element: PsiElement): HintInfo? {
         if (!(HintType.PARAMETER_HINT.isApplicable(element))) return null
         val parent: PsiElement = (element as? KtValueArgumentList)?.parent ?: return null

idea/src/org/jetbrains/kotlin/idea/codeInsight/hints/KotlinLambdasHintsProvider.kt

@@ -83,4 +83,17 @@ class KotlinLambdasHintsProvider : KotlinAbstractHintsProvider<KotlinLambdasHint
     }
 
     override fun createSettings(): Settings = Settings()
+
+    override val previewText: String? = """
+        val lambda = { i: Int ->
+            i + 10
+            i + 20
+        }
+
+        fun someFun() {    
+            GlobalScope.launch {
+                // someSuspendingFun()
+            }
+        }
+    """.trimIndent()
 }

idea/src/org/jetbrains/kotlin/idea/codeInsight/hints/KotlinReferencesTypeHintsProvider.kt

@@ -66,4 +66,22 @@ class KotlinReferencesTypeHintsProvider : KotlinAbstractHintsProvider<KotlinRefe
             else -> false
         }
     }
+
+    override val previewText: String? = """
+        val property = listOf(1, 2, 3).filter { num -> num % 2 == 0 }
+        
+        fun someFun(arg: Int) = print(arg)
+        
+        fun anotherFun(a: Int = 10, b: Int = 5): Int {
+            val variable = a + b
+            return variable * 2
+        }
+
+        fun yetAnotherFun() {
+            Stream.of(1, 2, 3)
+                .map { i -> i + 12 }
+                .filter { i -> i % 2 == 0 }
+                .collect(Collectors.toList())
+        }
+    """.trimIndent()
 }