Issue #2574917 by andrewmacpherson, googletorp: Regression: vertical tabs are...

Issue #2574917 by andrewmacpherson, googletorp: Regression: vertical tabs are not keyboard accessible

core/misc/vertical-tabs.js

@@ -120,8 +120,8 @@
     // Keyboard events added:
     // Pressing the Enter key will open the tab pane.
     this.link.on('keydown', function (event) {
-      event.preventDefault();
       if (event.keyCode === 13) {
+        event.preventDefault();
         self.focus();
         // Set focus on the first input field of the visible details/tab pane.
         $(".vertical-tabs__pane :input:visible:enabled").eq(0).trigger('focus');