Remove position: sticky

Source/core/css/resolver/StyleAdjuster.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 192 matching lines @@
     // object wedged in between them. Auto z-index also becomes 0 for objects that specify transforms/masks/reflections.
     if (style->hasAutoZIndex() && ((e && e->document().documentElement() == e)
         || style->opacity() < 1.0f
         || style->hasTransformRelatedProperty()
         || style->hasMask()
         || style->clipPath()
         || style->boxReflect()
         || style->hasFilter()
         || style->hasBlendMode()
         || style->hasIsolation()
-        || style->position() == StickyPosition
         || style->position() == FixedPosition
         || isInTopLayer(e, style)
         || hasWillChangeThatCreatesStackingContext(style)))
         style->setZIndex(0);
 
     // will-change:transform should result in the same rendering behavior as having a transform,
     // including the creation of a containing block for fixed position descendants.
     if (!style->hasTransform() && (style->willChangeProperties().contains(CSSPropertyWebkitTransform) || style->willChangeProperties().contains(CSSPropertyTransform))) {
         bool makeIdentity = true;
         style->setTransform(TransformOperations(makeIdentity));
@@ skipping 165 matching lines @@
         style->setDisplay(INLINE_BLOCK);
 
     // After performing the display mutation, check table rows. We do not honor position: relative table rows or cells.
     // This has been established for position: relative in CSS2.1 (and caused a crash in containingBlock()
     // on some sites).
     if ((style->display() == TABLE_HEADER_GROUP || style->display() == TABLE_ROW_GROUP
         || style->display() == TABLE_FOOTER_GROUP || style->display() == TABLE_ROW)
         && style->position() == RelativePosition)
         style->setPosition(StaticPosition);
 
-    // Cannot support position: sticky for table columns and column groups because current code is only doing
-    // background painting through columns / column groups
-    if ((style->display() == TABLE_COLUMN_GROUP || style->display() == TABLE_COLUMN)
-        && style->position() == StickyPosition)
-        style->setPosition(StaticPosition);
-
     // writing-mode does not apply to table row groups, table column groups, table rows, and table columns.
     // FIXME: Table cells should be allowed to be perpendicular or flipped with respect to the table, though.
     if (style->display() == TABLE_COLUMN || style->display() == TABLE_COLUMN_GROUP || style->display() == TABLE_FOOTER_GROUP
         || style->display() == TABLE_HEADER_GROUP || style->display() == TABLE_ROW || style->display() == TABLE_ROW_GROUP
         || style->display() == TABLE_CELL)
         style->setWritingMode(parentStyle->writingMode());
 
     // FIXME: Since we don't support block-flow on flexible boxes yet, disallow setting
     // of block-flow to anything other than TopToBottomWritingMode.
     // https://bugs.webkit.org/show_bug.cgi?id=46418 - Flexible box support.
     if (style->writingMode() != TopToBottomWritingMode && (style->display() == BOX || style->display() == INLINE_BOX))
         style->setWritingMode(TopToBottomWritingMode);
 
     if (isDisplayFlexibleBox(parentStyle->display()) || isDisplayGridBox(parentStyle->display())) {
         style->setFloating(NoFloat);
         style->setDisplay(equivalentBlockDisplay(style->display(), style->isFloating(), !m_useQuirksModeStyles));
     }
 }
 
 }