DevTools: Show scrollbars on a small FilteredListWidget

third_party/WebKit/Source/devtools/front_end/ui/Dialog.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 30 matching lines @@
     this.contentElement.tabIndex = 0;
     this.contentElement.addEventListener('focus', this.focus.bind(this), false);
     this.contentElement.addEventListener('keydown', this._onKeyDown.bind(this), false);
     this._dimmed = false;
     this._wrapsContent = false;
     this._maxSize = null;
     /** @type {?number} */
     this._positionX = null;
     /** @type {?number} */
     this._positionY = null;
+    this._fixedHeight = true;
 
     /** @type {!Map<!HTMLElement, number>} */
     this._tabIndexMap = new Map();
   }
 
   /**
    * @return {boolean}
    */
   static hasInstance() {
     return !!UI.Dialog._instance;
   }
 
   /**
    * @override
    * @suppressGlobalPropertiesCheck
    * TODO(dgozman): pass document in constructor.
    */
   show() {
     if (UI.Dialog._instance)
       UI.Dialog._instance.detach();
     UI.Dialog._instance = this;
 
     this._disableTabIndexOnElements(document);
 
     this._glassPane = new UI.GlassPane(document, this._dimmed, true /* blockPointerEvents*/, event => {
       this.detach();
       event.consume(true);
     });
+    this._glassPane.setFixedHeight(this._fixedHeight);
     this._glassPane.show();
     super.show(this._glassPane.contentElement);
     this._glassPane.setContentPosition(this._positionX, this._positionY);
     this._glassPane.setMaxContentSize(this._effectiveMaxSize());
     this._focusRestorer = new UI.WidgetFocusRestorer(this);
   }
 
   /**
    * @override
    */
@@ skipping 25 matching lines @@
   }
 
   /**
    * @param {!UI.Size} size
    */
   setMaxSize(size) {
     this._maxSize = size;
   }
 
   /**
+   * @param {boolean} fixedHeight
+   */
+  setFixedHeight(fixedHeight) {
+    this._fixedHeight = fixedHeight;
+  }
+
+  /**
    * @return {?UI.Size}
    */
   _effectiveMaxSize() {
     if (!this._wrapsContent)
       return this._maxSize;
     return new UI.Size(this.contentElement.offsetWidth, this.contentElement.offsetHeight).clipTo(this._maxSize);
   }
 
   /**
    * @param {boolean} wraps
@@ skipping 42 matching lines @@
   /**
    * @param {!Event} event
    */
   _onKeyDown(event) {
     if (event.keyCode === UI.KeyboardShortcut.Keys.Esc.code) {
       event.consume(true);
       this.detach();
     }
   }
 };