Fix check in `newline' for blank lines

* lisp/simple.el (newline): Clarify doc string and fix check for
blank lines (bug#13810).

diff --git a/lisp/simple.el b/lisp/simple.el
index 7dc695848bf5d6f1c8c8e4a459942018c06dab6f..d7486e51ddc278616f07840da0785b573d305964 100644 (file)
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -516,7 +516,7 @@ This hook is run by `delete-selection-uses-region-p', which see.")
   "Propertized string representing a hard newline character.")
 
 (defun newline (&optional arg interactive)
-  "Insert a newline, and move to left margin of the new line if it's blank.
+   "Insert a newline, and move to left margin of the new line.
 With prefix argument ARG, insert that many newlines.
 
 If `electric-indent-mode' is enabled, this indents the final new line
@@ -553,7 +553,7 @@ A non-nil INTERACTIVE argument means to run the `post-self-insert-hook'."
             (save-excursion
               (goto-char beforepos)
               (beginning-of-line)
-              (and (looking-at "[ \t]$")
+              (and (looking-at "[ \t]+$")
                    (> (current-left-margin) 0)
                    (delete-region (point)
                                   (line-end-position))))