FIR IDE: quickfix to add override keyword

Also enables more tests that covers previous quickfixes

compiler/testData/diagnostics/tests/subtyping/extensionOnLocalClasses.fir.kt

@@ -0,0 +1,9 @@
+package foo.bar
+
+fun test() {
+    class A {
+        inner class B
+    }
+
+    fun <!UNRESOLVED_REFERENCE!>A.B<!>.foo() {}
+}

generators/idea-generator/tests/org/jetbrains/kotlin/generators/tests/idea/GenerateTests.kt

@@ -1172,6 +1172,7 @@ fun main(args: Array<String>) {
                 model("quickfix/lateinit", pattern = pattern, filenameStartsLowerCase = true)
                 model("quickfix/modifiers", pattern = pattern, filenameStartsLowerCase = true, recursive = false)
                 model("quickfix/nullables/unsafeInfixCall", pattern = pattern, filenameStartsLowerCase = true)
+                model("quickfix/override", pattern = pattern, filenameStartsLowerCase = true, recursive = false)
                 model("quickfix/override/typeMismatchOnOverride", pattern = pattern, filenameStartsLowerCase = true, recursive = false)
                 model("quickfix/replaceInfixOrOperatorCall", pattern = pattern, filenameStartsLowerCase = true)
                 model("quickfix/replaceWithDotCall", pattern = pattern, filenameStartsLowerCase = true)

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

@@ -62,6 +62,10 @@ class MainKtQuickFixRegistrar : KtQuickFixRegistrar() {
             KtFirDiagnostic.AbstractClassMemberNotImplemented::class,
             AddModifierFix.addAbstractModifier
         )
+        registerPsiQuickFixes(
+            KtFirDiagnostic.VirtualMemberHidden::class,
+            AddModifierFix.addOverrideModifier
+        )
         registerPsiQuickFixes(KtFirDiagnostic.ValOrVarOnLoopParameter::class, RemoveValVarFromParameterFix)
         registerPsiQuickFixes(KtFirDiagnostic.ValOrVarOnFunParameter::class, RemoveValVarFromParameterFix)
         registerPsiQuickFixes(KtFirDiagnostic.ValOrVarOnCatchParameter::class, RemoveValVarFromParameterFix)

idea/idea-frontend-independent/src/org/jetbrains/kotlin/idea/quickfix/AddModifierFix.kt

@@ -111,6 +111,7 @@ open class AddModifierFix(
         val addOpenToContainingClass = AddModifierFix.createFactory(KtTokens.OPEN_KEYWORD, KtClassOrObject::class.java)
         val addFinalToProperty = AddModifierFix.createFactory(KtTokens.FINAL_KEYWORD, KtProperty::class.java)
         val addInnerModifier = createFactory(KtTokens.INNER_KEYWORD)
+        val addOverrideModifier = createFactory(KtTokens.OVERRIDE_KEYWORD)
 
         private val modalityModifiers: Set<KtModifierKeywordToken> =
             setOf(KtTokens.ABSTRACT_KEYWORD, KtTokens.OPEN_KEYWORD, KtTokens.FINAL_KEYWORD)

idea/testData/checker/Override.fir.kt

@@ -26,7 +26,7 @@ package override
     }
 
     <error descr="[ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED] Class MyIllegalClass4 is not abstract and does not implement abstract base class member bar">class MyIllegalClass4</error> : MyTrait, MyAbstractClass() {
-        fun foo() {}
+        fun <error descr="[VIRTUAL_MEMBER_HIDDEN] 'foo' hides member of supertype 'MyTrait' and needs 'override' modifier">foo</error>() {}
         override fun other() {}
     }
 

idea/testData/quickfix/override/changeToInvocation.kt

@@ -5,3 +5,4 @@ open class A {
 }
 
 class B : A<caret> {}
+/* IGNORE_FIR */

idea/testData/quickfix/override/overriddingMultipleFinalMethods.kt

@@ -18,3 +18,4 @@ interface Z {
 class B : A(), X, Y, Z {
     override<caret> fun foo() {}
 }
+/* IGNORE_FIR */

idea/testData/quickfix/override/overridingDelegatedMethod.kt

@@ -16,3 +16,4 @@ class B(y: XX) : A(y) {
     override<caret> fun foo() {
     }
 }
+/* IGNORE_FIR */

idea/testData/quickfix/override/overridingFakeOverride.kt

@@ -16,3 +16,4 @@ class B() : Y {
     override<caret> fun foo() {
     }
 }
+/* IGNORE_FIR */

idea/testData/quickfix/override/overridingFinalMethod.kt

@@ -5,4 +5,5 @@ open class A {
 
 class B : A() {
     override<caret> fun foo() {}
-}
+}
+/* IGNORE_FIR */

idea/testData/quickfix/override/overridingFinalMethodInLocal.kt

@@ -7,4 +7,5 @@ fun test() {
     val some = object : A() {
         <caret>override fun foo() {}
     }
-}
+}
+/* IGNORE_FIR */

idea/testData/quickfix/override/overridingFinalProperty.kt

@@ -5,4 +5,5 @@ open class A {
 
 class B : A() {
     override<caret> var x = 24;
-}
+}
+/* IGNORE_FIR */

idea/testData/quickfix/override/parameterNameChangedMultipleOverrideRenamePossible.kt

@@ -13,3 +13,4 @@ class B : A(), X {
         return agr
     }
 }
+/* IGNORE_FIR */

idea/testData/quickfix/override/parameterNameChangedRenamePossible.kt

@@ -9,3 +9,4 @@ class B : A() {
         return agr
     }
 }
+/* IGNORE_FIR */