Ticket #4791: 4791.patch

_source/plugins/htmldataprocessor/plugin.js

@@ -41 +41 @@
         function blockNeedsExtension( block )
         {
                 var lastChild = lastNoneSpaceChild( block );
-                return !lastChild || lastChild.type == CKEDITOR.NODE_ELEMENT && lastChild.name == 'br';
+
+                return !lastChild
+                        || lastChild.type == CKEDITOR.NODE_ELEMENT && lastChild.name == 'br'
+                        // Some of the controls in form needs extension too,
+                        // to move cursor at the end of the form. (#4791)
+                        || block.name == 'form' && lastChild.name == 'input';
         }
 
         function extendBlockForDisplay( block )