Break line if def equals is at columns + 1

Fixes scalameta#600

core/src/main/scala/org/scalafmt/internal/FormatOps.scala

@@ -187,14 +187,17 @@ class FormatOps(val tree: Tree, val initStyle: ScalafmtConfig) {
   @tailrec
   final def rhsOptimalToken(start: FormatToken): Token = start.right match {
     case Comma() | LeftParen() | RightParen() | RightBracket() | Semicolon() |
-        RightArrow()
+        RightArrow() | Equals()
         if next(start) != start &&
-          !owners(start.right).tokens.headOption.contains(start.right) &&
+          !startsNewBlock(start.right) &&
           newlinesBetween(start.between) == 0 =>
       rhsOptimalToken(next(start))
     case _ => start.left
   }
 
+  final def startsNewBlock(t: Token): Boolean =
+    owners(t).tokens.headOption.contains(t)
+
   /**
     * js.native is very special in Scala.js.
     *

core/src/test/resources/newlines/OffByOneParameterlessMethod.stat

@@ -0,0 +1,30 @@
+style = defaultWithAlign
+newlines.sometimesBeforeColonInMethodReturnType = false
+maxColumn = 32
+<<< equals is at column + 1
+object Test {
+//-----------------------------|
+  def test: Either[String, Int] = Right(0)
+}
+>>>
+object Test {
+//-----------------------------|
+  def test: Either[String,
+                   Int] =
+    Right(0)
+}
+<<< SKIP left brace is at column + 1
+object Test {
+//-----------------------------|
+  def ab: Either[String, Int] = {
+    Right(0)
+  }
+}
+>>>
+object Test {
+//-----------------------------|
+  def ab: Either[String,
+                 Int] = {
+    Right(0)
+  }
+}