Roll Polymer

third_party/polymer/v1_0/components-chromium/iron-dropdown/iron-dropdown-extracted.js

 (function() {
       'use strict';
 
       Polymer({
         is: 'iron-dropdown',
 
         behaviors: [
           Polymer.IronControlState,
           Polymer.IronA11yKeysBehavior,
           Polymer.IronOverlayBehavior,
@@ skipping 104 matching lines @@
         },
 
         ready: function() {
           // Memoized scrolling position, used to block scrolling outside.
           this._scrollTop = 0;
           this._scrollLeft = 0;
           // Used to perform a non-blocking refit on scroll.
           this._refitOnScrollRAF = null;
         },
 
+        attached: function () {
+          if (!this.sizingTarget || this.sizingTarget === this) {
+            this.sizingTarget = this.containedElement;
+          }
+        },
+
         detached: function() {
           this.cancelAnimation();
+          document.removeEventListener('scroll', this._boundOnCaptureScroll);
           Polymer.IronDropdownScrollManager.removeScrollLock(this);
         },
 
         /**
          * Called when the value of `opened` changes.
          * Overridden from `IronOverlayBehavior`
          */
         _openedChanged: function() {
           if (this.opened && this.disabled) {
             this.cancel();
           } else {
             this.cancelAnimation();
-            this.sizingTarget = this.containedElement || this.sizingTarget;
             this._updateAnimationConfig();
             this._saveScrollPosition();
             if (this.opened) {
               document.addEventListener('scroll', this._boundOnCaptureScroll);
               !this.allowOutsideScroll && Polymer.IronDropdownScrollManager.pushScrollLock(this);
             } else {
               document.removeEventListener('scroll', this._boundOnCaptureScroll);
               Polymer.IronDropdownScrollManager.removeScrollLock(this);
             }
             Polymer.IronOverlayBehaviorImpl._openedChanged.apply(this, arguments);
@@ skipping 113 matching lines @@
         _applyFocus: function () {
           var focusTarget = this.focusTarget || this.containedElement;
           if (focusTarget && this.opened && !this.noAutoFocus) {
             focusTarget.focus();
           } else {
             Polymer.IronOverlayBehaviorImpl._applyFocus.apply(this, arguments);
           }
         }
       });
     })();