Fix bug for rails 4.2.

app/assets/stylesheets/gallery_card.css

@@ -25,7 +25,6 @@
 
 .gallery.card-group .card.card-flip.h-100 {
   position: relative;
-  overflow: hidden;
   width: 25%;
   width: calc( 25% - 0.75em);
   background: white;

app/assets/stylesheets/theater.css

@@ -1,11 +1,6 @@
 @import url(https://fonts.googleapis.com/css?family=Roboto);
 
 /* Reset and basic styles */
-
-body {
-  overflow-x: hidden;
-}
-
 *,
 *:before,
 *:after {

app/controllers/admin/galleries_controller.rb

@@ -7,6 +7,7 @@ class Admin::GalleriesController < OrbitAdminController
   layout :compute_layout
   find_tag = Tag.all.select{|value| value.name==I18n.t('gallery.not_show_desc')}
   RackTempMiddleExist = defined?(Rack::TempfileReaper)
+  RACK_TEMPFILES = defined?(Rack::RACK_TEMPFILES) ? Rack::RACK_TEMPFILES : rack.tempfiles
   if find_tag.length==0
     module_app_id = ModuleApp.where(:key=>"gallery").first[:_id]
     tags = ModuleApp.where(:key=>"gallery").first.tags
@@ -559,7 +560,7 @@ class Admin::GalleriesController < OrbitAdminController
         album_unprocess.save_var = file
         album_unprocess.save!
         ObjectSpace.undefine_finalizer(file.tempfile)
-        request.set_header(Rack::RACK_TEMPFILES, []) if RackTempMiddleExist # Avoid Rack::TempfileReaper Middleware to unlink temp files automatically.
+        request.set_header(RACK_TEMPFILES, []) if RackTempMiddleExist # Avoid Rack::TempfileReaper Middleware to unlink temp files automatically.
       end
       image.save!
     end

modules/gallery/_gallery_widget4.html.erb

@@ -35,4 +35,17 @@
       </div>
     </div>
   </div>
+  <script>
+    $(document).ready(function(){
+      $('[data-subpart-id="{{subpart-id}}"] .card-body a').on('focusin', function(){
+        var _this = $(this);
+        var card_flip = _this.parents('.card-flip');
+        card_flip.addClass('hover-class');
+        var off_hover = function(){
+          card_flip.removeClass('hover-class');
+        }
+        _this.one('focusout', off_hover);
+      })
+    })
+  </script>
 </div>