Allow let declarations on multiple lines to align vertically (as is the Xcode standard)

[SebastianLjungman]

We recently enabled running swift-format as a pre-commit hook, and while setting up the configuration/rules I noticed that there doesn't seem to be a way to enforce the standard alignment of let declarations on multiple lines.

E.g.: When typing the following in Xcode, each let aligns perfectly vertical with the first let after pressing Enter:

class TestClass {
    var x: Bool? = true
    var y: Bool? = false
    var z: Bool? = true
    
    func test() -> String {
        if let x = self.x,
           let y = self.y,
           let z = self.z
        {
            return "Hello"
        } else {
            return "Goodbye"
        }
    }
}

But once I run swift-format, all the let:s with the exception of the first one is indented one whitespace further!

class TestClass {
    var x: Bool? = true
    var y: Bool? = false
    var z: Bool? = true

    func test() -> String {
        if let x = self.x,
            let y = self.y,
            let z = self.z
        {
            return "Hello"
        } else {
            return "Goodbye"
        }
    }
}

This looks ugly, and it's weird that the linter would enforce a standard that doesn't match the editor behavior, especially without an option to turn it off. Is it perhaps a bug?

I'm using swift-driver version: 1.127.14.1 Apple Swift version 6.2 (swiftlang-6.2.0.19.9 clang-1700.3.19.1)
Target: arm64-apple-macosx26.0