Ticket #30366: 30366.6.patch

src/wp-content/themes/twentyfifteen/js/functions.js

@@ -74 +74 @@
                                                 topOffset = ( $sidebar.offset().top > 0 ) ? $sidebar.offset().top - adminbarOffset : 0;
                                                 $sidebar.attr( 'style', 'top: ' + topOffset + 'px;' );
                                         } else if ( ! bottom && windowPos + windowHeight > sidebarHeight + $sidebar.offset().top ) {
-                                                bottom = true;
-                                                $sidebar.attr( 'style', 'position: fixed;bottom: 0;' );
+                                                if ( $document.height() != sidebarHeight ){
+                                                        bottom = true;
+                                                        $sidebar.attr( 'style', 'position: fixed;bottom: 0;' );
+                                                }       
                                         }
                                 } else if ( windowPos < lastWindowPos ) {
                                         if ( bottom ) {