Workaround that doesn't add unwanted newline.

CHANGELOG

@@ -4,6 +4,7 @@ v 7.12.0 (unreleased)
 - Allow to configure location of the `.gitlab_shell_secret` file. (Jakub Jirutka)
 v 7.11.0 (unreleased)
+  - Get editing comments to work in Chrome 43 again.
   - Fix broken view when viewing history of a file that includes a path that used to be another file (Stan Hu)
   - Don't show duplicate deploy keys
   - Fix commit time being displayed in the wrong timezone in some cases (Hannes Rosenögger)

app/assets/javascripts/notes.js.coffee

@@ -313,11 +313,12 @@ class @Notes
     textarea = form.find("textarea")
     textarea.focus()
-    # HACK (rspeicher): Work around a Chrome 43 bug(?).
+    # HACK (rspeicher/DouweM): Work around a Chrome 43 bug(?).
     # The textarea has the correct value, Chrome just won't show it unless we
-    # modify it, so let's add a newline!
-    textarea.val (_, value) ->
-      "#{value}\n"
+    # modify it, so let's clear it and re-set it!
+    value = textarea.val()
+    textarea.val ""
+    textarea.val value
     disableButtonIfEmptyField textarea, form.find(".js-comment-button")