Don't close the share modal when clicking Preview

www/common/common-interface.js

@@ -348,7 +348,8 @@ define([
             if (!b.name || !b.onClick) { return; }
             var button = h('button', { tabindex: '1', 'class': b.className || '' }, b.name);
             $(button).click(function () {
-                b.onClick();
+                var noClose = b.onClick();
+                if (noClose) { return; }
                 var $modal = $(button).parents('.alertify').first();
                 if ($modal.length && $modal[0].closeModal) {
                     $modal[0].closeModal(function () {

www/common/common-ui-elements.js

@@ -1101,6 +1101,7 @@ define([
                     embed: Util.isChecked($(link).find('#cp-share-embed'))
                   });
                   window.open(v);
+                  return true;
               },
               keys: [[13, 'ctrl']]
             },