An override can be omitted if it does not modify the inherited signature semantics, for example, by changing visibility.

Example:

  open class Foo {
      open fun singleExpression() {
      }
  }

  class Bar : Foo() {
      override fun singleExpression() = super.singleExpression()
  }

After the quick-fix is applied:

  class Bar : Foo() {
  }