[Devtools] Fixed scrolling in network panel

third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js

Index: third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
diff --git a/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js b/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
index 7dc4d44a27b2aa373a0413b21a8b67c3accd6b10..97f7f46af56fd12d29efa8a4f5818b93e71a1f60 100644
--- a/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
+++ b/third_party/WebKit/Source/devtools/front_end/network/NetworkLogViewColumns.js
@@ -173,7 +173,11 @@ Network.NetworkLogViewColumns = class {
       return;
     this._waterfallScrollerContent.style.height = this._dataGridScroller.scrollHeight + 'px';
     this._updateScrollerWidthIfNeeded();
-    this._dataGridScroller.scrollTop = this._waterfallScroller.scrollTop;
+    var scrollDifference = this._dataGridScroller.scrollTop - this._waterfallScroller.scrollTop;
+    // Ensure we scroll by at least 3 px because of rounding. See: Element.prototype.isScrolledToBottom
+    if (Math.abs(scrollDifference) < 3)
+      scrollDifference = -3;

[luoe, 2017/01/25 17:07:06]

If we check just based on scrollDifference, we may apply this check even when
scrolling a small amount in the middle.  Maybe we only want to do this when
adding the difference would move it too close to the bottom?

var wouldBeCloseToBottom = dataGridScroller.scrollHeight -
(dataGridScroller.scrollTop - scrollDifference) <= 2;
if (wouldBeCloseToBottom) {
    if (scrollDifference < 0) // jump to bottom
    else if (scrolllDifference > 0) // use scrollDifference - 3
}

[allada, 2017/01/25 22:38:54]

Done.

+    this._dataGridScroller.scrollTop -= scrollDifference;
   }
 
   _updateScrollerWidthIfNeeded() {