[Swift] Muti-line string literals are not handled

[designatednerd]

Intended outcome:

Multi-line string literals are part of the graphQL spec and should be handled by the Swift codegen.

Actual outcome:

They are not at present. See this discussion and this discussion for more details.

How to reproduce the issue:

Thanks to @lilyball for the example:

mutation {
  sendEmail(message: """
    Hello,
      World!

    Yours,
      GraphQL.
  """)
}

is equivalent to

mutation {
  sendEmail(message: "Hello,\n  World!\n\nYours,\n  GraphQL.")
}

With changes in #1441, this will turn into:

mutation {
  sendEmail(message: "Hello, World! Yours, GraphQL.")
}

Versions

2.16 and below (iOS 0.13.0 and below)

[designatednerd]

This is fixed in v2.17