Allowing wrapping inside the content of a richtext editor

We disable wrapping on the container to keep the editor and the
help on the same line, but need to turn it back on again inside
the editor so that autogrow can work.

app/assets/stylesheets/common.css.scss

@@ -1617,12 +1617,12 @@ a.button.submit {
   .richtext_content {
     display: inline-block;
     vertical-align: top;
+    white-space: normal;
 
     .richtext_preview {
       display: inline-block;
       padding: 20px;
       background-color: #f4f4ff;
-      white-space: normal;
 
       &.loading {
         background-image: image-url("loading.gif");