DO NOT COMMIT DevTools: reintroduce fullViewportUpdate

third_party/WebKit/Source/devtools/front_end/console/ConsoleViewport.js

Index: third_party/WebKit/Source/devtools/front_end/console/ConsoleViewport.js
diff --git a/third_party/WebKit/Source/devtools/front_end/console/ConsoleViewport.js b/third_party/WebKit/Source/devtools/front_end/console/ConsoleViewport.js
index 89ae0cb8d8aa72efdc67e9af54f02d97030c76eb..571a5efedd5670fcfa473e5f75a9e310509619cf 100644
--- a/third_party/WebKit/Source/devtools/front_end/console/ConsoleViewport.js
+++ b/third_party/WebKit/Source/devtools/front_end/console/ConsoleViewport.js
@@ -372,6 +372,13 @@ Console.ConsoleViewport = class {
       this.element.scrollTop = 10000000;
   }
 
+  fullViewportInvalidate() {
+    for (var i = 0; i < this._renderedItems.length; ++i)
+      this._renderedItems[i].willHide();
+    this._contentElement.removeChildren();
+    this.invalidate();
+  }
+
   /**
    * @param {function()} prepare
    */
@@ -379,7 +386,7 @@ Console.ConsoleViewport = class {
     var itemsToRender = new Set();
     for (var i = this._firstActiveIndex; i <= this._lastActiveIndex; ++i)
       itemsToRender.add(this._providerElement(i));
-    var willBeHidden = this._renderedItems.filter(item => !itemsToRender.has(item));
+    var willBeHidden = this._renderedItems.filter(item => item.element().parentElement && !itemsToRender.has(item));
     for (var i = 0; i < willBeHidden.length; ++i)
       willBeHidden[i].willHide();
     prepare();
@@ -390,8 +397,8 @@ Console.ConsoleViewport = class {
     var anchor = this._contentElement.firstChild;
     for (var viewportElement of itemsToRender) {
       var element = viewportElement.element();
+      var shouldCallWasShown = !element.parentElement;
       if (element !== anchor) {
-        var shouldCallWasShown = !element.parentElement;
         if (shouldCallWasShown)
           wasShown.push(viewportElement);
         this._contentElement.insertBefore(element, anchor);