add preventDefault support for all inital event types (show, close, hide, etc.) + fix small bug with scrollspy.last

js/bootstrap-tab.js

@@ -39,6 +39,7 @@
         , selector = $this.attr('data-target')
         , previous
         , $target
+        , e
 
       if (!selector) {
         selector = $this.attr('href')
@@ -49,11 +50,14 @@
 
       previous = $ul.find('.active a').last()[0]
 
-      $this.trigger({
-        type: 'show'
-      , relatedTarget: previous
+      e = $.Event('show', {
+        relatedTarget: previous
       })
 
+      $this.trigger(e)
+
+      if (e.isDefaultPrevented()) return
+
       $target = $(selector)
 
       this.activate($this.parent('li'), $ul)