Ticket #28732: 28732.patch

src/wp-admin/js/theme.js

@@ -443 +443 @@
                 // Set focused theme to current element
                 themes.focusedTheme = this.$el;
 
+                // If a user ctrl, cmd or middle mouse clicks then open theme details
+                // in new tab instead of showing the modal
+                if ( event.metaKey || event.ctrlKey || 2 === event.which ) {
+                        var href = themes.router.baseUrl( themes.router.themePath + self.model.cid );
+                        window.open( href, '_blank' );
+                        return;
+                }
+
                 this.trigger( 'theme:expand', self.model.cid );
         },