Avoid touching z-index in StyleAdjuster by using an isStackingContext flag instead

third_party/WebKit/Source/core/style/StyleRareNonInheritedData.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 95 matching lines @@
     , m_wrapFlow(ComputedStyle::initialWrapFlow())
     , m_wrapThrough(ComputedStyle::initialWrapThrough())
     , m_hasCurrentOpacityAnimation(false)
     , m_hasCurrentTransformAnimation(false)
     , m_hasCurrentFilterAnimation(false)
     , m_hasCurrentBackdropFilterAnimation(false)
     , m_runningOpacityAnimationOnCompositor(false)
     , m_runningTransformAnimationOnCompositor(false)
     , m_runningFilterAnimationOnCompositor(false)
     , m_runningBackdropFilterAnimationOnCompositor(false)
+    , m_isStackingContext(false)
     , m_effectiveBlendMode(ComputedStyle::initialBlendMode())
     , m_touchAction(ComputedStyle::initialTouchAction())
     , m_objectFit(ComputedStyle::initialObjectFit())
     , m_isolation(ComputedStyle::initialIsolation())
     , m_contain(ComputedStyle::initialContain())
     , m_scrollBehavior(ComputedStyle::initialScrollBehavior())
     , m_scrollSnapType(ComputedStyle::initialScrollSnapType())
     , m_requiresAcceleratedCompositingForExternalReasons(false)
     , m_hasInlineTransform(false)
     , m_resize(ComputedStyle::initialResize())
@@ skipping 62 matching lines @@
     , m_wrapFlow(o.m_wrapFlow)
     , m_wrapThrough(o.m_wrapThrough)
     , m_hasCurrentOpacityAnimation(o.m_hasCurrentOpacityAnimation)
     , m_hasCurrentTransformAnimation(o.m_hasCurrentTransformAnimation)
     , m_hasCurrentFilterAnimation(o.m_hasCurrentFilterAnimation)
     , m_hasCurrentBackdropFilterAnimation(o.m_hasCurrentBackdropFilterAnimation)
     , m_runningOpacityAnimationOnCompositor(o.m_runningOpacityAnimationOnCompositor)
     , m_runningTransformAnimationOnCompositor(o.m_runningTransformAnimationOnCompositor)
     , m_runningFilterAnimationOnCompositor(o.m_runningFilterAnimationOnCompositor)
     , m_runningBackdropFilterAnimationOnCompositor(o.m_runningBackdropFilterAnimationOnCompositor)
+    , m_isStackingContext(o.m_isStackingContext)
     , m_effectiveBlendMode(o.m_effectiveBlendMode)
     , m_touchAction(o.m_touchAction)
     , m_objectFit(o.m_objectFit)
     , m_isolation(o.m_isolation)
     , m_contain(o.m_contain)
     , m_scrollBehavior(o.m_scrollBehavior)
     , m_scrollSnapType(o.m_scrollSnapType)
     , m_requiresAcceleratedCompositingForExternalReasons(o.m_requiresAcceleratedCompositingForExternalReasons)
     , m_hasInlineTransform(o.m_hasInlineTransform)
     , m_resize(o.m_resize)
@@ skipping 62 matching lines @@
         && marginBeforeCollapse == o.marginBeforeCollapse
         && marginAfterCollapse == o.marginAfterCollapse
         && m_appearance == o.m_appearance
         && m_textDecorationStyle == o.m_textDecorationStyle
         && m_wrapFlow == o.m_wrapFlow
         && m_wrapThrough == o.m_wrapThrough
         && m_hasCurrentOpacityAnimation == o.m_hasCurrentOpacityAnimation
         && m_hasCurrentTransformAnimation == o.m_hasCurrentTransformAnimation
         && m_hasCurrentFilterAnimation == o.m_hasCurrentFilterAnimation
         && m_hasCurrentBackdropFilterAnimation == o.m_hasCurrentBackdropFilterAnimation
+        && m_isStackingContext == o.m_isStackingContext
         && m_effectiveBlendMode == o.m_effectiveBlendMode
         && m_touchAction == o.m_touchAction
         && m_objectFit == o.m_objectFit
         && m_isolation == o.m_isolation
         && m_contain == o.m_contain
         && m_scrollBehavior == o.m_scrollBehavior
         && m_scrollSnapType == o.m_scrollSnapType
         && m_requiresAcceleratedCompositingForExternalReasons == o.m_requiresAcceleratedCompositingForExternalReasons
         && m_hasInlineTransform == o.m_hasInlineTransform
         && m_resize == o.m_resize
@@ skipping 62 matching lines @@
 {
     return dataEquivalent(m_shapeOutside, o.m_shapeOutside);
 }
 
 bool StyleRareNonInheritedData::clipPathDataEquivalent(const StyleRareNonInheritedData& o) const
 {
     return dataEquivalent(m_clipPath, o.m_clipPath);
 }
 
 } // namespace blink