DevTools: do not scroll console to bottom on resize

Source/devtools/front_end/console/ConsoleView.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 71 matching lines @@
     this._filter.addFilters(this._filterBar);
 
     this._viewport = new WebInspector.ViewportControl(this);
     this._viewport.setStickToBottom(true);
     this._viewport.contentElement().classList.add("console-group", "console-group-messages");
     this._contentsElement.appendChild(this._viewport.element);
     this._messagesElement = this._viewport.element;
     this._messagesElement.id = "console-messages";
     this._messagesElement.classList.add("monospace");
     this._messagesElement.addEventListener("click", this._messagesClicked.bind(this), true);
-    this._scrolledToBottom = true;
 
     this._viewportThrottler = new WebInspector.Throttler(50);
 
     this._filterStatusMessageElement = document.createElementWithClass("div", "console-message");
     this._messagesElement.insertBefore(this._filterStatusMessageElement, this._messagesElement.firstChild);
     this._filterStatusTextElement = this._filterStatusMessageElement.createChild("span", "console-info");
     this._filterStatusMessageElement.createTextChild(" ");
     var resetFiltersLink = this._filterStatusMessageElement.createChild("span", "console-info node-link");
     resetFiltersLink.textContent = WebInspector.UIString("Show all messages.");
     resetFiltersLink.addEventListener("click", this._filter.reset.bind(this._filter), true);
@@ skipping 305 matching lines @@
     },
 
     focus: function()
     {
         if (this._promptElement === WebInspector.currentFocusElement())
             return;
         WebInspector.setCurrentFocusElement(this._promptElement);
         this._prompt.moveCaretToEndOfPrompt();
     },
 
-    storeScrollPositions: function()
-    {
-        WebInspector.View.prototype.storeScrollPositions.call(this);
-        this._scrolledToBottom = this._messagesElement.isScrolledToBottom();
-    },
-
     restoreScrollPositions: function()
     {
-        if (this._scrolledToBottom)
-            this._immediatelyScrollIntoView();
+        if (this._viewport.scrolledToBottom())
+            this._immediatelyScrollToBottom();
         else
             WebInspector.View.prototype.restoreScrollPositions.call(this);
     },
 
     onResize: function()
     {
         this._scheduleViewportRefresh();
         this._prompt.hideSuggestBox();
-        this.restoreScrollPositions();
+        if (this._viewport.scrolledToBottom())
+            this._immediatelyScrollToBottom();
     },
 
     _scheduleViewportRefresh: function()
     {
         /**
          * @param {!WebInspector.Throttler.FinishCallback} finishCallback
          * @this {WebInspector.ConsoleView}
          */
         function invalidateViewport(finishCallback)
         {
             this._viewport.invalidate();
             finishCallback();
         }
         this._viewportThrottler.schedule(invalidateViewport.bind(this));
     },
 
-    _immediatelyScrollIntoView: function()
+    _immediatelyScrollToBottom: function()
     {
         // This will scroll viewport and trigger its refresh.
         this._promptElement.scrollIntoView(true);
     },
 
     _updateFilterStatus: function()
     {
         this._filterStatusTextElement.textContent = WebInspector.UIString(this._hiddenByFilterCount === 1 ? "%d message is hidden by filters." : "%d messages are hidden by filters.", this._hiddenByFilterCount);
         this._filterStatusMessageElement.style.display = this._hiddenByFilterCount ? "" : "none";
     },
@@ skipping 97 matching lines @@
             return new WebInspector.ConsoleGroupViewMessage(message, this._linkifier, nestingLevel);
         default:
             return new WebInspector.ConsoleViewMessage(message, this._linkifier, nestingLevel);
         }
     },
 
     _consoleCleared: function()
     {
         this._clearCurrentSearchResultHighlight();
         this._consoleMessages = [];
-        this._scrolledToBottom = true;
         this._updateMessageList();
 
         if (this._searchRegex)
             this._searchableView.updateSearchMatchesCount(0);
 
         this._linkifier.reset();
     },
 
     _handleContextMenuEvent: function(event)
     {
@@ skipping 639 matching lines @@
 WebInspector.ConsoleView.ShowConsoleActionDelegate.prototype = {
     /**
      * @return {boolean}
      */
     handleAction: function()
     {
         WebInspector.console.show();
         return true;
     }
 }