feat(scope): broadcast $destroy event on scope destruction

perf testing shows that in chrome this change adds 5-15% overhead
when destroying 10k nested scopes where each scope has a $destroy listener

1 files changed, 2 insertions, 1 deletions

diff --git a/src/service/scope.js b/src/service/scope.js
index ef1b7b93..b7ee61d6 100644
--- a/src/service/scope.js
+++ b/src/service/scope.js
@@ -136,7 +136,6 @@ function $RootScopeProvider(){
       this.$$phase = this.$parent = this.$$watchers =
                      this.$$nextSibling = this.$$prevSibling =
                      this.$$childHead = this.$$childTail = null;
-      this.$destructor = noop;
       this['this'] = this.$root =  this;
       this.$$asyncQueue = [];
       this.$$listeners = {};
@@ -458,6 +457,8 @@ function $RootScopeProvider(){
         if (this.$root == this) return; // we can't remove the root node;
         var parent = this.$parent;
 
+        this.$broadcast('$destroy');
+
         if (parent.$$childHead == this) parent.$$childHead = this.$$nextSibling;
         if (parent.$$childTail == this) parent.$$childTail = this.$$prevSibling;
         if (this.$$prevSibling) this.$$prevSibling.$$nextSibling = this.$$nextSibling;