LayoutMenuList::ControlClipRect may depend on size of children

third_party/WebKit/Source/core/paint/PaintPropertyTreeUpdateTests.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/html/HTMLIFrameElement.h"
+#include "core/html/HTMLSelectElement.h"
 #include "core/paint/PaintPropertyTreeBuilderTest.h"
 #include "core/paint/PaintPropertyTreePrinter.h"
 
 namespace blink {
 
 // Tests covering incremental updates of paint property trees.
 class PaintPropertyTreeUpdateTest : public PaintPropertyTreeBuilderTest {};
 
 INSTANTIATE_TEST_CASE_P(All, PaintPropertyTreeUpdateTest, ::testing::Bool());
 
@@ skipping 729 matching lines @@
   auto* transform = child->PaintProperties()->Transform();
   EXPECT_TRUE(transform->FlattensInheritedTransform());
 
   GetDocument().getElementById("parent")->setAttribute(
       HTMLNames::styleAttr, "transform-style: preserve-3d");
   GetDocument().View()->UpdateAllLifecyclePhases();
   EXPECT_EQ(transform, child->PaintProperties()->Transform());
   EXPECT_FALSE(transform->FlattensInheritedTransform());
 }
 
+TEST_P(PaintPropertyTreeUpdateTest, MenuListControlClipChange) {
+  SetBodyInnerHTML(
+      "<select id='select' style='white-space: normal'>"
+      "  <option></option>"
+      "  <option>bar</option>"
+      "</select>");
+
+  auto* select = GetLayoutObjectByElementId("select");
+  EXPECT_NE(nullptr, select->PaintProperties()->OverflowClip());
+
+  // Should not assert in FindPropertiesNeedingUpdate.
+  toHTMLSelectElement(select->GetNode())->setSelectedIndex(1);
+  GetDocument().View()->UpdateAllLifecyclePhases();
+  EXPECT_NE(nullptr, select->PaintProperties()->OverflowClip());
+}
+
 }  // namespace blink