y = y + x) that can be replaced with an operator assignment.
The quick-fix replaces the assignment with an assignment operator.
Example:
fun foo() {
val list = mutableListOf(1, 2, 3)
list = list + 4
}
After the quick-fix is applied:
fun foo() {
val list = mutableListOf(1, 2, 3)
list += 4
}