Strip trailing whitespaces at the end of converted do block

* lisp/progmodes/ruby-mode.el (ruby-brace-to-do-end):
Strip trailing whitespaces at the end of converted do block
(bug#36756).

https://bugs.ruby-lang.org/issues/16014
https://github.com/syl20bnr/spacemacs/issues/12548

1 files changed, 2 insertions, 1 deletions

diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index 8eadf018a67..340c689f02e 100644
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -1690,7 +1690,8 @@ See `add-log-current-defun-function'."
     (when (eq (char-before) ?\})
       (delete-char -1)
       (when (save-excursion
-              (skip-chars-backward " \t")
+              (let ((n (skip-chars-backward " \t")))
+                (if (< n 0) (delete-char (- n))))
               (not (bolp)))
         (insert "\n"))
       (insert "end")