Make abstract: do not suggest for inline classes #KT-28268 Fixed

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

@@ -32,6 +32,7 @@ import org.jetbrains.kotlin.idea.inspections.KotlinUniversalQuickFix
 import org.jetbrains.kotlin.idea.refactoring.canRefactor
 import org.jetbrains.kotlin.idea.util.runOnExpectAndAllActuals
 import org.jetbrains.kotlin.lexer.KtModifierKeywordToken
+import org.jetbrains.kotlin.lexer.KtToken
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.lexer.KtTokens.*
 import org.jetbrains.kotlin.psi.*
@@ -130,6 +131,10 @@ open class AddModifierFix(
                         if (parentClassOrObject is KtObjectDeclaration) return null
                         if (parentClassOrObject is KtEnumEntry) return null
                     }
+                    if (modifier == ABSTRACT_KEYWORD
+                        && modifierListOwner is KtClass
+                        && modifierListOwner.hasModifier(KtTokens.INLINE_KEYWORD)
+                    ) return null
                 }
                 INNER_KEYWORD -> {
                     if (modifierListOwner is KtObjectDeclaration) return null

idea/testData/quickfix/abstract/makeInlineClassAbstract.kt

@@ -0,0 +1,12 @@
+// "Make 'A' abstract" "false"
+// ERROR: Class 'A' is not abstract and does not implement abstract member public abstract fun foo(): String defined in I
+// ERROR: Primary constructor is required for inline class
+// ACTION: Create test
+// ACTION: Implement members
+// ACTION: Move 'A' to separate file
+// ACTION: Rename file to A.kt
+interface I {
+    fun foo(): String
+}
+
+inline class A<caret> : I

idea/tests/org/jetbrains/kotlin/idea/quickfix/QuickFixTestGenerated.java

@@ -136,6 +136,11 @@ public class QuickFixTestGenerated extends AbstractQuickFixTest {
             runTest("idea/testData/quickfix/abstract/makeEnumEntryAbstract.kt");
         }
 
+        @TestMetadata("makeInlineClassAbstract.kt")
+        public void testMakeInlineClassAbstract() throws Exception {
+            runTest("idea/testData/quickfix/abstract/makeInlineClassAbstract.kt");
+        }
+
         @TestMetadata("makeObjectMemberAbstract.kt")
         public void testMakeObjectMemberAbstract() throws Exception {
             runTest("idea/testData/quickfix/abstract/makeObjectMemberAbstract.kt");