Don't adjust scroll for selection if it's already empty.

third_party/WebKit/Source/core/paint/ObjectPaintInvalidator.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/ObjectPaintInvalidator.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/layout/compositing/CompositedLayerMapping.h"
@@ skipping 401 matching lines @@
 {
     // Update selection rect when we are doing full invalidation (in case that the object is moved,
     // composite status changed, etc.) or shouldInvalidationSelection is set (in case that the
     // selection itself changed).
     bool fullInvalidation = isImmediateFullPaintInvalidationReason(reason);
     if (!fullInvalidation && !m_object.shouldInvalidateSelection())
         return;
 
     LayoutRect oldSelectionRect = selectionPaintInvalidationMap().get(&m_object);
     LayoutRect newSelectionRect = m_object.localSelectionRect();
-    if (!newSelectionRect.isEmpty())
+    if (!newSelectionRect.isEmpty()) {
         m_context.mapLocalRectToPaintInvalidationBacking(m_object, newSelectionRect);
-
-    newSelectionRect.move(m_object.scrollAdjustmentForPaintInvalidation(*m_context.paintInvalidationContainer));
+        newSelectionRect.move(m_object.scrollAdjustmentForPaintInvalidation(*m_context.paintInvalidationContainer));
+    }
 
     setPreviousSelectionPaintInvalidationRect(m_object, newSelectionRect);
 
     if (!fullInvalidation) {
         fullyInvalidatePaint(PaintInvalidationSelection, oldSelectionRect, newSelectionRect);
         m_context.paintingLayer->setNeedsRepaint();
         m_object.invalidateDisplayItemClients(PaintInvalidationSelection);
     }
 }
 
@@ skipping 31 matching lines @@
     m_object.invalidateDisplayItemClients(reason);
     return reason;
 }
 
 DisablePaintInvalidationStateAsserts::DisablePaintInvalidationStateAsserts()
     : m_disabler(&gDisablePaintInvalidationStateAsserts, true)
 {
 }
 
 } // namespace blink