"Redundant visibility": Fix false positive for overridden setter

#KT-26051 Fixed

idea/idea-core/src/org/jetbrains/kotlin/idea/core/psiModificationUtils.kt

@@ -27,6 +27,7 @@ import org.jetbrains.kotlin.extensions.DeclarationAttributeAltererExtension
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.caches.resolve.resolveToDescriptorIfAny
 import org.jetbrains.kotlin.idea.references.mainReference
+import org.jetbrains.kotlin.idea.search.usagesSearch.descriptor
 import org.jetbrains.kotlin.idea.util.IdeDescriptorRenderers
 import org.jetbrains.kotlin.lexer.KtModifierKeywordToken
 import org.jetbrains.kotlin.lexer.KtTokens
@@ -251,8 +252,20 @@ fun KtModifierListOwner.setVisibility(visibilityModifier: KtModifierKeywordToken
     addModifier(visibilityModifier)
 }
 
-fun KtDeclaration.implicitVisibility(): KtModifierKeywordToken? =
-    when {
+fun KtDeclaration.implicitVisibility(): KtModifierKeywordToken? {
+    if (this is KtPropertyAccessor && this.isSetter) {
+        val property = this.property
+        if (property.hasModifier(KtTokens.OVERRIDE_KEYWORD)) {
+            val visibility = (property.descriptor as? PropertyDescriptor)
+                ?.overriddenDescriptors
+                ?.firstOrNull()
+                ?.setter
+                ?.visibility
+                ?.toKeywordToken()
+            if (visibility != null) return visibility
+        }
+    }
+    return when {
         this is KtConstructor<*> -> {
             val klass = getContainingClassOrObject()
             if (klass is KtClass && (klass.isEnum() || klass.isSealed())) KtTokens.PRIVATE_KEYWORD
@@ -268,6 +281,7 @@ fun KtDeclaration.implicitVisibility(): KtModifierKeywordToken? =
             KtTokens.DEFAULT_VISIBILITY_KEYWORD
         }
     }
+}
 
 fun KtModifierListOwner.canBePrivate() = modifierList?.hasModifier(KtTokens.ABSTRACT_KEYWORD) != true