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bug#27503: 26.0.50; Not lining up Javascript arguments

From: Ingo Lohmar
Subject: bug#27503: 26.0.50; Not lining up Javascript arguments
Date: Tue, 27 Jun 2017 20:16:14 +0200

I've been meaning to post this for months, guess now is as good a time
as any.  Here's an alternative take that I've been using for a long time
without noticing any bugs.  It is a less intrusive change to achieve the
desired effect AFAICT:

diff --git i/lisp/progmodes/js.el w/lisp/progmodes/js.el
index bae9e52bf0..a27db82eb0 100644
--- i/lisp/progmodes/js.el
+++ w/lisp/progmodes/js.el
@@ -475,6 +475,11 @@ js-flat-functions
   :type 'boolean
   :group 'js)
+(defcustom js-cont-nonempty-list-indent-rigidly nil
+  "Indent continuation of non-empty ([{ lines in `js-mode' rigidly."
+  :type 'boolean
+  :group 'js)
 (defcustom js-comment-lineup-func #'c-lineup-C-comments
   "Lineup function for `cc-mode-style', for C comments in `js-mode'."
   :type 'function
@@ -2092,7 +2097,8 @@ js--proper-indentation
                  (switch-keyword-p (looking-at "default\\_>\\|case\\_>[^:]"))
                  (continued-expr-p (js--continued-expression-p)))
              (goto-char (nth 1 parse-status)) ; go to the opening char
-             (if (looking-at "[({[]\\s-*\\(/[/*]\\|$\\)")
+             (if (or js-cont-nonempty-list-indent-rigidly
+                     (looking-at "[({[]\\s-*\\(/[/*]\\|$\\)"))
                  (progn ; nothing following the opening paren/bracket
                    (skip-syntax-backward " ")
                    (when (eq (char-before) ?\)) (backward-list))

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