Let Implement Quickfix: Launch "Implement Members" dialog after applying #KT-11836 Fixed

idea/src/org/jetbrains/kotlin/idea/quickfix/LetImplementInterfaceFix.kt

@@ -18,8 +18,10 @@ package org.jetbrains.kotlin.idea.quickfix
 
 import com.intellij.codeInsight.intention.LowPriorityAction
 import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.fileEditor.FileEditorManager
 import com.intellij.openapi.project.Project
 import com.intellij.psi.PsiFile
+import org.jetbrains.kotlin.idea.core.overrideImplement.ImplementMembersHandler
 import org.jetbrains.kotlin.idea.quickfix.createFromUsage.callableBuilder.containsStarProjections
 import org.jetbrains.kotlin.idea.util.IdeDescriptorRenderers
 import org.jetbrains.kotlin.idea.util.ShortenReferences
@@ -73,5 +75,15 @@ class LetImplementInterfaceFix(
         val superTypeEntry = KtPsiFactory(element).createSuperTypeEntry(expectedTypeNameSourceCode)
         val entryElement = element.addSuperTypeListEntry(superTypeEntry)
         ShortenReferences.DEFAULT.process(entryElement)
+
+        val implementMembersHandler = ImplementMembersHandler()
+        if (implementMembersHandler.collectMembersToGenerate(element).isEmpty()) return
+
+        if (editor != null) {
+            editor.caretModel.moveToOffset(element.textRange.startOffset)
+            val containingFile = element.containingFile
+            FileEditorManager.getInstance(project).openFile(containingFile.virtualFile, true)
+            implementMembersHandler.invoke(project, editor, containingFile)
+        }
     }
 }

idea/testData/quickfix/typeMismatch/letClassImplementInterface.kt

@@ -9,5 +9,7 @@ fun bar() {
 fun foo(a: A) {
 }
 
-interface A
+interface A {
+    fun gav()
+}
 class B

idea/testData/quickfix/typeMismatch/letClassImplementInterface.kt.after

@@ -2,12 +2,18 @@
 package let.implement
 
 fun bar() {
-    foo(B()<caret>)
+    foo(B())
 }
 
 
 fun foo(a: A) {
 }
 
-interface A
-class B : A
+interface A {
+    fun gav()
+}
+class B : A {
+    override fun gav() {
+        throw UnsupportedOperationException()
+    }
+}