Remove states in code, the designer show wrong information

Reproduction steps:

1.Create a qt quick application using wizard
2.Activate the qml designer
3.Add two states in designer mode such as State1, State2， State3
4.Go to code mode and remove State1 and State2
5.Go back to designer mode

Expected result:
State3 is shown in the State view panel

Actual result:
State1 is shown in the State view panel and Warning widget popup remind "Invalid state name:Name already used in another state"

Comment:
SDKTestRound5