ios – Change characters typed on TextEditor in SwiftUI

I am making an attempt to seize the textual content typed in a TextEditor, retailer it in a variable and replace what’s displayed on the TextEditor itself. I am utilizing the .onChange() to set off and seize what’s being typed, retailer it in a variable, and alter the present textual content being displayed. However the issue is that, .onChange() is being referred to as twice: First, when i kind the textual content contained in the TextEditor; and Second, when i attempt to set a special character for the view itself.

struct ChatView: View {
    @State var chatTextInput: String = ""
    @State var oldChatValue: String = ""
    @State var newChatValue: String = ""
    
    var physique: some View {
        VStack {
            TextEditor(textual content: $chatTextInput)
                .onChange(of: chatTextInput) { newValue in
                    oldChatValue += "a"
                    newChatValue += newValue.final.map{String($0)}!
                    chatTextInput = oldChatValue
                    
                }
        }
    }
}

For exemple, if i kind qwerty, newChatValue is printed as Qawaearataya and chatTextInput receives aaaaaaaaaaaa

Any clues on the right way to forestall the .onChange to being triggered the second time, when i set the brand new character for the TextEditor textual content?

Thanks lots!