FIR IDE: add quickfix to add abstract modifier for MUST_BE_INITIALIZED_OR_BE_ABSTRACT

idea/idea-fir/src/org/jetbrains/kotlin/idea/quickfix/MainKtQuickFixRegistrar.kt

@@ -56,6 +56,13 @@ class MainKtQuickFixRegistrar : KtQuickFixRegistrar() {
         )
     }
 
+    private val propertyInitialization = KtQuickFixesListBuilder.registerPsiQuickFix {
+        registerPsiQuickFixes(
+            KtFirDiagnostic.MustBeInitializedOrBeAbstract::class,
+            AddModifierFix.addAbstractModifier,
+        )
+    }
+
     private val overrides = KtQuickFixesListBuilder.registerPsiQuickFix {
         registerApplicator(ChangeTypeQuickFix.changeFunctionReturnTypeOnOverride)
         registerApplicator(ChangeTypeQuickFix.changePropertyReturnTypeOnOverride)
@@ -76,6 +83,7 @@ class MainKtQuickFixRegistrar : KtQuickFixRegistrar() {
 
     override val list: KtQuickFixesList = KtQuickFixesList.createCombined(
         modifiers,
+        propertyInitialization,
         overrides,
         mutability,
         expressions,

idea/testData/quickfix/abstract/mustBeInitializedOrBeAbstract.kt

@@ -2,5 +2,3 @@
 abstract class A() {
     var <caret>i : Int
 }
-
-/* IGNORE_FIR */

idea/testData/quickfix/abstract/mustBeInitializedOrBeAbstract.kt.after

@@ -2,5 +2,3 @@
 abstract class A() {
     abstract var <caret>i : Int
 }
-
-/* IGNORE_FIR */

idea/testData/quickfix/abstract/mustBeInitializedOrBeAbstractInFinalClass.kt

@@ -2,5 +2,3 @@
 class A() {
     var <caret>i : Int
 }
-
-/* IGNORE_FIR */

idea/testData/quickfix/abstract/mustBeInitializedOrBeAbstractInFinalClass.kt.after

@@ -2,5 +2,3 @@
 abstract class A() {
     abstract var <caret>i : Int
 }
-
-/* IGNORE_FIR */

idea/testData/quickfix/abstract/mustBeInitializedOrBeAbstractInOpenClass.kt

@@ -2,5 +2,3 @@
 open class A() {
     var <caret>i : Int
 }
-
-/* IGNORE_FIR */

idea/testData/quickfix/abstract/mustBeInitializedOrBeAbstractInOpenClass.kt.after

@@ -2,5 +2,3 @@
 abstract class A() {
     abstract var <caret>i : Int
 }
-
-/* IGNORE_FIR */