Tweak priorities of paint invalidation reasons

third_party/WebKit/Source/core/paint/SVGModelObjectPaintInvalidator.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/SVGModelObjectPaintInvalidator.h"
 
 #include "core/layout/svg/LayoutSVGModelObject.h"
 #include "core/paint/ObjectPaintInvalidator.h"
 
 namespace blink {
 
 PaintInvalidationReason SVGModelObjectPaintInvalidator::invalidatePaintIfNeeded()
 {
     PaintInvalidationReason reason = ObjectPaintInvalidator(m_object, m_context).computePaintInvalidationReason();
 
     // Disable incremental invalidation for SVG objects to prevent under-
     // invalidation. Unlike boxes, it is non-trivial (and rare) for SVG objects
     // to be able to be incrementally invalidated (e.g., on height changes).
-    if (reason == PaintInvalidationIncremental)
+    if (reason == PaintInvalidationIncremental && m_context.oldBounds != m_context.newBounds)
         reason = PaintInvalidationFull;
 
     return ObjectPaintInvalidator(m_object, m_context).invalidatePaintIfNeededWithComputedReason(reason);
 }
 
 } // namespace blink