FormatWriter: implement align.delayUntilSpace

[kitbellew]

Fixes #3614.

[treetime]

Should this interact with Align.multiline?
For

spaces.inParentheses = false
align.delayUntilSpace = false
align.tokens."+" = [ { code = ":" }, { code = "(" }, { code = ")" }, { code = "=" } ]

Given:

object potato {
   def meeethod1(pram1:   AnyRef): Any = ???

   def methd2(paaaaaram2: Any):    Any = ???
   def meth3(param33333:  Any):    Any = ???
   def md4(param4:        Any):    Any = ???
}

yields:

object potato {
  def meeethod1(pram1: AnyRef): Any = ???

  def methd2(paaaaaram2: Any): Any = ???
  def meth3 (param33333: Any): Any = ???
  def md4   (param4    : Any): Any = ???
}

Adding align.multiline=true yields the same; I would've expected alignment to happen despite the newline.

[kitbellew]

Should this interact with Align.multiline? For

this is orthogonal to multiline; also, in your example, none of the expressions are occupying multiple lines.

keep in mind that alignment applies to successive lines only, and there's a blank line, the current alignment block is flushed.

[tgodzik]

LGTM

[tgodzik]

Actually, I would have thought it would work like this always with alignment, though I don't use so never tested. I guess since this changes the default, we need the additional flag.