DevTools: remove isTrusted check and isUserGesture from ViewportControl

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

Index: third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js b/third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js
index 7db48ee418bcb46a860b58299d228ad44c51ddc6..6de10a89226490cd01b0aa9f422d57a5ef20646e 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js
@@ -380,9 +380,9 @@ WebInspector.ViewportControl.prototype = {
     },
 
     /**
-     * @param {boolean} isUserGesture
+     * @param {boolean} isScroll
      */
-    _innerRefresh: function(isUserGesture)
+    _innerRefresh: function(isScroll)

[lushnikov, 2016/07/19 00:19:49]

let's just remove this argument altogether

     {
         if (!this._visibleHeight())
             return;  // Do nothing for invisible controls.
@@ -416,11 +416,14 @@ WebInspector.ViewportControl.prototype = {
         var oldFirstVisibleIndex = this._firstVisibleIndex;
         var oldLastVisibleIndex = this._lastVisibleIndex;
 
-        var shouldStickToBottom = !isUserGesture && this._stickToBottom && this._scrolledToBottom;
+        var shouldStickToBottom = this._stickToBottom && this._scrolledToBottom;
 
         if (shouldStickToBottom) {
             this._lastVisibleIndex = this._itemCount - 1;
             this._firstVisibleIndex = Math.max(this._itemCount - Math.ceil(visibleHeight / this._provider.minimumRowHeight()), 0);
+
+            if (isScroll)
+                this._firstVisibleIndex = Math.max(Array.prototype.lowerBound.call(this._cumulativeHeights, visibleFrom + 1), 0);

[lushnikov, 2016/07/19 00:19:49]

let's kill this - viewport control should work fine without these lines

         } else {
             this._firstVisibleIndex = Math.max(Array.prototype.lowerBound.call(this._cumulativeHeights, visibleFrom + 1), 0);
             // Proactively render more rows in case some of them will be collapsed without triggering refresh. @see crbug.com/390169
@@ -568,7 +571,7 @@ WebInspector.ViewportControl.prototype = {
      */
     _onScroll: function(event)
     {
-        this._innerRefresh(event.isTrusted);
+        this._innerRefresh(true);
     },
 
     /**