Make `getComputedStyle` return the correct style for collapsed <img> elements.

third_party/WebKit/Source/core/css/resolver/SharedStyleFinder.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/)
@@ skipping 27 matching lines @@
 #include "core/dom/Document.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/Node.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/dom/QualifiedName.h"
 #include "core/dom/SpaceSplitString.h"
 #include "core/dom/StyleEngine.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/InsertionPoint.h"
 #include "core/html/HTMLElement.h"
+#include "core/html/HTMLImageElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLOptGroupElement.h"
 #include "core/html/HTMLOptionElement.h"
 #include "core/style/ComputedStyle.h"
 #include "core/svg/SVGElement.h"
 #include "platform/instrumentation/tracing/TraceEvent.h"
 #include "wtf/HashSet.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
@@ skipping 221 matching lines @@
            toHTMLOptionElement(element()).selected() ||
        toHTMLOptionElement(candidate).spatialNavigationFocused() !=
            toHTMLOptionElement(element()).spatialNavigationFocused()))
     return false;
 
   // FIXME: This line is surprisingly hot, we may wish to inline
   // hasDirectionAuto into StyleResolver.
   if (candidate.isHTMLElement() && toHTMLElement(candidate).hasDirectionAuto())
     return false;
 
+  if (isHTMLImageElement(candidate) && isHTMLImageElement(element()) &&
+      toHTMLImageElement(candidate).isCollapsed() !=
+          toHTMLImageElement(element()).isCollapsed()) {

[esprehn, 2017/02/15 02:08:46]

good catch!

+    return false;
+  }
+
   if (candidate.isLink() && m_context.elementLinkState() != style->insideLink())
     return false;
 
   if (candidate.isUnresolvedV0CustomElement() !=
       element().isUnresolvedV0CustomElement())
     return false;
 
   if (element().parentOrShadowHostElement() != parent) {
     if (!parent->isStyledElement())
       return false;
@@ skipping 98 matching lines @@
   if (!element().parentElementOrShadowRoot()->childrenSupportStyleSharing()) {
     INCREMENT_STYLE_STATS_COUNTER(document().styleEngine(),
                                   sharedStyleRejectedByParent, 1);
     return nullptr;
   }
 
   return shareElement->mutableComputedStyle();
 }
 
 }  // namespace blink