Adjust indentation when using multiple if-let expressions

[DevYeom]

Tested on 510.1.0 with 2 spaces for indentation.

Input:

func test() {
  if let abc,
     let def
  {
    print("hello")
  }
}

Output:

func test() {
  if let abc,
    let def
  {
    print("hello")
  }
}

Input code was formatted using Re-Indent (⌃I) in Xcode. It appears that the default indentation rule was applied. How about adding a rule for adjusting the indentation of multiple if-let expressions?

[ahoppen]

Synced to Apple’s issue tracker as rdar://127922850

[allevato]

We made a fairly conscious decision early on to keep all indentation sizes fixed, rather than offering context-based variant indentations.

It's something we could revisit in the future, but for now, this is by design, and I want to be deliberate about increasing the surface area of the formatter's configurability. Each new setting creates the potential for interactions with other settings, making it harder to reason about.

[DevYeom]

Thanks!