Invalidate the bigger rect if one rect contains the other in LayoutObject::fullyInvalidateRect()

third_party/WebKit/Source/core/layout/LayoutObject.cpp

Index: third_party/WebKit/Source/core/layout/LayoutObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.cpp b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
index 7f99056f295989d367d4e20e5db8bc2c3d001678..101e9457a46145baca86bc6c8e4d2ba29bbf9f54 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.cpp
@@ -1576,15 +1576,19 @@ void LayoutObject::incrementallyInvalidatePaint(const LayoutBoxModelObject& pain
 
 void LayoutObject::fullyInvalidatePaint(const LayoutBoxModelObject& paintInvalidationContainer, PaintInvalidationReason invalidationReason, const LayoutRect& oldBounds, const LayoutRect& newBounds)
 {
-    // Otherwise do full paint invalidation.
-    LayoutRect invalidationRect = oldBounds;
-    adjustInvalidationRectForCompositedScrolling(invalidationRect, paintInvalidationContainer);
-    invalidatePaintUsingContainer(paintInvalidationContainer, invalidationRect, invalidationReason);
-    if (newBounds != oldBounds) {
-        invalidationRect = newBounds;
+    // The following logic avoids invalidating twice if one set of bounds contains the other.
+    if (!newBounds.contains(oldBounds)) {
+        LayoutRect invalidationRect = oldBounds;
         adjustInvalidationRectForCompositedScrolling(invalidationRect, paintInvalidationContainer);
         invalidatePaintUsingContainer(paintInvalidationContainer, invalidationRect, invalidationReason);
+
+        if (oldBounds.contains(newBounds))
+            return;
     }
+
+    LayoutRect invalidationRect = newBounds;
+    adjustInvalidationRectForCompositedScrolling(invalidationRect, paintInvalidationContainer);
+    invalidatePaintUsingContainer(paintInvalidationContainer, invalidationRect, invalidationReason);
 }
 
 void LayoutObject::invalidatePaintForOverflow()