[refmt] Incorrect indentation when right side of pipe operator (|>) is multi-line

Input:

m
|> StringMap.add("a", 1)
|> StringMap.fold_right(
  (el, m) => StringMap.add(el, 1, m),
  ["someReallyLongString"]
)
|> StringMap.add("h", 1);

Desired output:

m
|> StringMap.add("a", 1)
|> StringMap.fold_right(
    (el, m) => StringMap.add(el, 1, m),
    ["someReallyLongString"]
  )
|> StringMap.add("h", 1);

Actual output:

m
|> StringMap.add("a", 1)
|> StringMap.fold_right(
     (el, m) => StringMap.add(el, 1, m),
     ["someReallyLongString"]
   )
|> StringMap.add("h", 1);

It's bad that the indented lines are not tab-aligned. They have 5, 5, and 3 spaces in front.

Slightly relevant prettier example: https://goo.gl/6eXRLn

(Edit: No longer relevant comment) Less confident in the desired output because now the closing paren aligns with the |> operator. However prettier does support the JavaScript pipeline proposal and does alignment more similar to the desired output above: https://goo.gl/vvfTfb

Start by running the supplied pipeline input through refmt and compare its indentation with the desired and actual outputs in the issue. Trace the formatter behavior for a multi-line right-hand side of the |>(pipe) operator; done means the inner lines are consistently indented and the closing parenthesis matches the stated desired output.