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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/201292">201292</a></dd>
<dt>Author</dt> <dd>ryanhaddad@apple.com</dd>
<dt>Date</dt> <dd>2016-05-23 13:25:03 -0700 (Mon, 23 May 2016)</dd>
</dl>

<h3>Log Message</h3>
<pre>Unreviewed, rolling out <a href="http://trac.webkit.org/projects/webkit/changeset/200414">r200414</a>.

This change appears to have broken the 'write a reply' field
on Nextdoor.com

Reverted changeset:

&quot;Clicks inside button elements are sometimes discarded when
the mouse moves&quot;
https://bugs.webkit.org/show_bug.cgi?id=39620
http://trac.webkit.org/changeset/200414</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
<li><a href="#trunkLayoutTestsplatformiossimulatorTestExpectations">trunk/LayoutTests/platform/ios-simulator/TestExpectations</a></li>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoredomNodecpp">trunk/Source/WebCore/dom/Node.cpp</a></li>
<li><a href="#trunkSourceWebCoredomNodeh">trunk/Source/WebCore/dom/Node.h</a></li>
<li><a href="#trunkSourceWebCorepageEventHandlercpp">trunk/Source/WebCore/page/EventHandler.cpp</a></li>
</ul>

<h3>Removed Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfasteventsclickoverdescendantelementsexpectedtxt">trunk/LayoutTests/fast/events/click-over-descendant-elements-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfasteventsclickoverdescendantelementshtml">trunk/LayoutTests/fast/events/click-over-descendant-elements.html</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (201291 => 201292)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog        2016-05-23 20:14:45 UTC (rev 201291)
+++ trunk/LayoutTests/ChangeLog        2016-05-23 20:25:03 UTC (rev 201292)
</span><span class="lines">@@ -1,5 +1,19 @@
</span><span class="cx"> 2016-05-23  Ryan Haddad  &lt;ryanhaddad@apple.com&gt;
</span><span class="cx"> 
</span><ins>+        Unreviewed, rolling out r200414.
+
+        This change appears to have broken the 'write a reply' field
+        on Nextdoor.com
+
+        Reverted changeset:
+
+        &quot;Clicks inside button elements are sometimes discarded when
+        the mouse moves&quot;
+        https://bugs.webkit.org/show_bug.cgi?id=39620
+        http://trac.webkit.org/changeset/200414
+
+2016-05-23  Ryan Haddad  &lt;ryanhaddad@apple.com&gt;
+
</ins><span class="cx">         Marking fast/text-autosizing/ios/text-autosizing-after-back.html as a flaky timeout on Mac and iOS
</span><span class="cx">         https://bugs.webkit.org/show_bug.cgi?id=157589
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunkLayoutTestsfasteventsclickoverdescendantelementsexpectedtxt"></a>
<div class="delfile"><h4>Deleted: trunk/LayoutTests/fast/events/click-over-descendant-elements-expected.txt (201291 => 201292)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/events/click-over-descendant-elements-expected.txt        2016-05-23 20:14:45 UTC (rev 201291)
+++ trunk/LayoutTests/fast/events/click-over-descendant-elements-expected.txt        2016-05-23 20:25:03 UTC (rev 201292)
</span><span class="lines">@@ -1,27 +0,0 @@
</span><del>-Check if any mousedown-mouseup pairs in one element dispatch click events.
-
-On success, you will see a series of &quot;PASS&quot; messages, followed by &quot;TEST COMPLETE&quot;.
-
-
-Very normal click on container:
-PASS lastClickTarget is container
-Move inside container:
-PASS lastClickTarget is container
-Move from container to a child:
-PASS lastClickTarget is container
-Move from a child to container:
-PASS lastClickTarget is container
-Move from a child to another child:
-PASS lastClickTarget is container
-Move out from a child:
-PASS lastClickTarget is document.body
-Removing a child element in the light DOM during a click:
-FAIL lastClickTarget should be null. Was [object HTMLDivElement].
-Click on escaping button content:
-PASS lastClickTarget is button1
-Click on disappearing INPUT value:
-PASS lastClickTarget is input1
-PASS successfullyParsed is true
-
-TEST COMPLETE
-
</del></span></pre></div>
<a id="trunkLayoutTestsfasteventsclickoverdescendantelementshtml"></a>
<div class="delfile"><h4>Deleted: trunk/LayoutTests/fast/events/click-over-descendant-elements.html (201291 => 201292)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/events/click-over-descendant-elements.html        2016-05-23 20:14:45 UTC (rev 201291)
+++ trunk/LayoutTests/fast/events/click-over-descendant-elements.html        2016-05-23 20:25:03 UTC (rev 201292)
</span><span class="lines">@@ -1,144 +0,0 @@
</span><del>-&lt;!DOCTYPE html&gt;
-&lt;body&gt;
-&lt;script src=&quot;../../resources/js-test-pre.js&quot;&gt;&lt;/script&gt;
-&lt;style&gt;
-body {
-    margin: 0;
-    padding: 0;
-    -webkit-user-select: none;
-}
-
-#container {
-    padding: 40px;
-}
-
-#inner1, #inner2 {
-    height: 40px;
-}
-
-#button1 {
-    padding-top: 4px;
-}
-#button1:active {
-    padding-top: 40px;
-}
-&lt;/style&gt;
-&lt;div id=&quot;container&quot;&gt;
-&lt;div id=&quot;inner1&quot;&gt;&lt;/div&gt;
-&lt;div id=&quot;inner2&quot;&gt;&lt;/div&gt;
-&lt;/div&gt;
-&lt;button id=&quot;button1&quot;&gt;&lt;span id=&quot;button-span&quot;&gt;Click me&lt;/span&gt;&lt;/button&gt;
-&lt;input id=&quot;input1&quot; value=&quot;A quick brown fox jumps over the lazy dog. A quick brown fox jumps over the lazy dog.&quot;&gt;
-&lt;!-- Avoid to create a console element before the above elements --&gt;
-&lt;div id=&quot;console&quot;&gt;&lt;/div&gt;
-&lt;script&gt;
-description('Check if any mousedown-mouseup pairs in one element dispatch click events.');
-if (!window.eventSender)
-    debug('This test needs to run in a test environment.');
-
-var container = document.getElementById('container');
-var containerRect = container.getBoundingClientRect();
-var inner1 = document.getElementById('inner1');
-var inner1Rect = inner1.getBoundingClientRect();
-var inner2 = document.getElementById('inner2');
-var inner2Rect = inner2.getBoundingClientRect();
-var x = (containerRect.left + containerRect.right) / 2;
-var inContainer = (containerRect.top + inner1Rect.top) / 2;
-var inInner1 = (inner1Rect.top + inner1Rect.bottom) / 2;
-var inInner2 = (inner2Rect.top + inner2Rect.bottom) / 2;
-
-var lastClickTarget = null;
-document.addEventListener('click', function(event) {
-    lastClickTarget = event.target;
-}, false);
-
-function clearClick()
-{
-    eventSender.mouseMoveTo(0, 0);
-    eventSender.mouseDown(1);
-    eventSender.mouseUp(1);
-    lastClickTarget;
-}
-
-
-debug('Very normal click on container:');
-eventSender.mouseMoveTo(x, inContainer);
-eventSender.mouseDown();
-eventSender.mouseUp();
-shouldBe('lastClickTarget', 'container');
-clearClick();
-
-debug('Move inside container:');
-eventSender.mouseMoveTo(x, inContainer);
-eventSender.mouseDown();
-eventSender.mouseMoveTo(x + 10, inContainer);
-eventSender.mouseUp();
-shouldBe('lastClickTarget', 'container');
-clearClick();
-
-debug('Move from container to a child:');
-eventSender.mouseMoveTo(x, inContainer);
-eventSender.mouseDown();
-eventSender.mouseMoveTo(x, inInner1);
-eventSender.mouseUp();
-shouldBe('lastClickTarget', 'container');
-clearClick();
-
-debug('Move from a child to container:');
-eventSender.mouseMoveTo(x, inInner1);
-eventSender.mouseDown();
-eventSender.mouseMoveTo(x, inContainer);
-eventSender.mouseUp();
-shouldBe('lastClickTarget', 'container');
-clearClick();
-
-debug('Move from a child to another child:');
-eventSender.mouseMoveTo(x, inInner1);
-eventSender.mouseDown();
-eventSender.mouseMoveTo(x, inInner2);
-eventSender.mouseUp();
-shouldBe('lastClickTarget', 'container');
-clearClick();
-
-debug('Move out from a child:');
-eventSender.mouseMoveTo(x, inInner1);
-eventSender.mouseDown();
-eventSender.mouseMoveTo(x, containerRect.bottom + 10);
-eventSender.mouseUp();
-shouldBe('lastClickTarget', 'document.body');
-clearClick();
-
-debug('Removing a child element in the light DOM during a click:');
-eventSender.mouseMoveTo(x, inInner2);
-eventSender.mouseDown();
-inner2.remove();
-eventSender.mouseUp();
-shouldBeNull('lastClickTarget');
-clearClick();
-
-debug('Click on escaping button content:');
-var button1 = document.getElementById(&quot;button1&quot;);
-var spanRect = document.getElementById('button-span').getBoundingClientRect();
-eventSender.mouseMoveTo((spanRect.left + spanRect.right) / 2, spanRect.top + 1);
-eventSender.mouseDown();
-eventSender.mouseUp();
-shouldBe('lastClickTarget', 'button1');
-clearClick();
-
-debug('Click on disappearing INPUT value:');
-var input1 = document.getElementById('input1');
-input1.addEventListener('focus', function() { input1.value = &quot;&quot;; }, false);
-var inputRect = input1.getBoundingClientRect();
-eventSender.mouseMoveTo(inputRect.left + 8, (inputRect.top + inputRect.bottom) / 2);
-eventSender.mouseDown();
-eventSender.mouseUp();
-shouldBe('lastClickTarget', 'input1');
-clearClick();
-
-container.remove();
-button1.remove();
-input1.remove();
-
-&lt;/script&gt;
-&lt;script src=&quot;../../resources/js-test-post.js&quot;&gt;&lt;/script&gt;
-&lt;/body&gt;
</del></span></pre></div>
<a id="trunkLayoutTestsplatformiossimulatorTestExpectations"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/platform/ios-simulator/TestExpectations (201291 => 201292)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/platform/ios-simulator/TestExpectations        2016-05-23 20:14:45 UTC (rev 201291)
+++ trunk/LayoutTests/platform/ios-simulator/TestExpectations        2016-05-23 20:25:03 UTC (rev 201292)
</span><span class="lines">@@ -1654,7 +1654,6 @@
</span><span class="cx"> fast/events/show-modal-dialog-onblur-onfocus.html [ Failure ]
</span><span class="cx"> fast/events/tab-focus-link-in-canvas.html [ Failure ]
</span><span class="cx"> fast/events/tabindex-focus-blur-all.html [ Failure ]
</span><del>-fast/events/click-over-descendant-elements.html [ Failure ]
</del><span class="cx"> 
</span><span class="cx"> # Ref-test imported from W3C that is failing because type=image input elements have rounded corners on iOS.
</span><span class="cx"> imported/w3c/web-platform-tests/html/semantics/forms/the-input-element/image01.html [ ImageOnlyFailure ]
</span></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (201291 => 201292)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2016-05-23 20:14:45 UTC (rev 201291)
+++ trunk/Source/WebCore/ChangeLog        2016-05-23 20:25:03 UTC (rev 201292)
</span><span class="lines">@@ -1,3 +1,17 @@
</span><ins>+2016-05-23  Ryan Haddad  &lt;ryanhaddad@apple.com&gt;
+
+        Unreviewed, rolling out r200414.
+
+        This change appears to have broken the 'write a reply' field
+        on Nextdoor.com
+
+        Reverted changeset:
+
+        &quot;Clicks inside button elements are sometimes discarded when
+        the mouse moves&quot;
+        https://bugs.webkit.org/show_bug.cgi?id=39620
+        http://trac.webkit.org/changeset/200414
+
</ins><span class="cx"> 2016-05-23  Chris Dumez  &lt;cdumez@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         Clean up / Modernize the CSS Parser
</span></span></pre></div>
<a id="trunkSourceWebCoredomNodecpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/dom/Node.cpp (201291 => 201292)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/dom/Node.cpp        2016-05-23 20:14:45 UTC (rev 201291)
+++ trunk/Source/WebCore/dom/Node.cpp        2016-05-23 20:25:03 UTC (rev 201292)
</span><span class="lines">@@ -937,65 +937,6 @@
</span><span class="cx">     return false;
</span><span class="cx"> }
</span><span class="cx"> 
</span><del>-static inline Node* ancestor(Node* node, unsigned depth)
-{
-    for (unsigned i = 0; i &lt; depth; ++i)
-        node = node-&gt;parentNode();
-    return node;
-}
-
-Node* commonAncestor(Node&amp; thisNode, Node&amp; otherNode)
-{
-    unsigned thisDepth = 0;
-    for (auto node = &amp;thisNode; node; node = node-&gt;parentNode()) {
-        if (node == &amp;otherNode)
-            return node;
-        thisDepth++;
-    }
-    unsigned otherDepth = 0;
-    for (auto node = &amp;otherNode; node; node = node-&gt;parentNode()) {
-        if (node == &amp;thisNode)
-            return &amp;thisNode;
-        otherDepth++;
-    }
-
-    Node* thisAncestor = &amp;thisNode;
-    Node* otherAncestor = &amp;otherNode;
-    if (thisDepth &gt; otherDepth)
-        thisAncestor = ancestor(thisAncestor, thisDepth - otherDepth);
-    else if (otherDepth &gt; thisDepth)
-        otherAncestor = ancestor(otherAncestor, otherDepth - thisDepth);
-
-    for (; thisAncestor; thisAncestor = thisAncestor-&gt;parentNode()) {
-        if (thisAncestor == otherAncestor)
-            return thisAncestor;
-        otherAncestor = otherAncestor-&gt;parentNode();
-    }
-    ASSERT(!otherAncestor);
-    return nullptr;
-}
-
-Node* commonAncestorCrossingShadowBoundary(Node&amp; node, Node&amp; other)
-{
-    if (&amp;node == &amp;other)
-        return &amp;node;
-
-    Element* shadowHost = node.shadowHost();
-    // FIXME: This test might be wrong for user-authored shadow trees.
-    if (shadowHost &amp;&amp; shadowHost == other.shadowHost())
-        return shadowHost;
-
-    TreeScope* scope = commonTreeScope(&amp;node, &amp;other);
-    if (!scope)
-        return nullptr;
-
-    Node* parentNode = scope-&gt;ancestorInThisScope(&amp;node);
-    ASSERT(parentNode);
-    Node* parentOther = scope-&gt;ancestorInThisScope(&amp;other);
-    ASSERT(parentOther);
-    return commonAncestor(*parentNode, *parentOther);
-}
-
</del><span class="cx"> Node* Node::pseudoAwarePreviousSibling() const
</span><span class="cx"> {
</span><span class="cx">     Element* parentOrHost = is&lt;PseudoElement&gt;(*this) ? downcast&lt;PseudoElement&gt;(*this).hostElement() : parentElement();
</span></span></pre></div>
<a id="trunkSourceWebCoredomNodeh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/dom/Node.h (201291 => 201292)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/dom/Node.h        2016-05-23 20:14:45 UTC (rev 201291)
+++ trunk/Source/WebCore/dom/Node.h        2016-05-23 20:25:03 UTC (rev 201292)
</span><span class="lines">@@ -784,9 +784,6 @@
</span><span class="cx"> 
</span><span class="cx"> #endif
</span><span class="cx"> 
</span><del>-Node* commonAncestor(Node&amp;, Node&amp;);
-Node* commonAncestorCrossingShadowBoundary(Node&amp;, Node&amp;);
-
</del><span class="cx"> } // namespace WebCore
</span><span class="cx"> 
</span><span class="cx"> #if ENABLE(TREE_DEBUGGING)
</span></span></pre></div>
<a id="trunkSourceWebCorepageEventHandlercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/page/EventHandler.cpp (201291 => 201292)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/page/EventHandler.cpp        2016-05-23 20:14:45 UTC (rev 201291)
+++ trunk/Source/WebCore/page/EventHandler.cpp        2016-05-23 20:25:03 UTC (rev 201292)
</span><span class="lines">@@ -1955,6 +1955,24 @@
</span><span class="cx">     m_clickNode = nullptr;
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+static Node* targetNodeForClickEvent(Node* mousePressNode, Node* mouseReleaseNode)
+{
+    if (!mousePressNode || !mouseReleaseNode)
+        return nullptr;
+
+    if (mousePressNode == mouseReleaseNode)
+        return mouseReleaseNode;
+
+    Element* mouseReleaseShadowHost = mouseReleaseNode-&gt;shadowHost();
+    if (mouseReleaseShadowHost &amp;&amp; mouseReleaseShadowHost == mousePressNode-&gt;shadowHost()) {
+        // We want to dispatch the click to the shadow tree host element to give listeners the illusion that the
+        // shadom tree is a single element. For example, we want to give the illusion that &lt;input type=&quot;range&quot;&gt;
+        // is a single element even though it is a composition of multiple shadom tree elements.
+        return mouseReleaseShadowHost;
+    }
+    return nullptr;
+}
+
</ins><span class="cx"> bool EventHandler::handleMouseReleaseEvent(const PlatformMouseEvent&amp; platformMouseEvent)
</span><span class="cx"> {
</span><span class="cx">     RefPtr&lt;FrameView&gt; protector(m_frame.view());
</span><span class="lines">@@ -2016,8 +2034,7 @@
</span><span class="cx"> 
</span><span class="cx">     bool contextMenuEvent = platformMouseEvent.button() == RightButton;
</span><span class="cx"> 
</span><del>-    Node* targetNode = mouseEvent.targetNode();
-    Node* nodeToClick = (m_clickNode &amp;&amp; targetNode) ? commonAncestorCrossingShadowBoundary(*m_clickNode, *targetNode) : nullptr;
</del><ins>+    Node* nodeToClick = targetNodeForClickEvent(m_clickNode.get(), mouseEvent.targetNode());
</ins><span class="cx">     bool swallowClickEvent = m_clickCount &gt; 0 &amp;&amp; !contextMenuEvent &amp;&amp; nodeToClick &amp;&amp; !dispatchMouseEvent(eventNames().clickEvent, nodeToClick, true, m_clickCount, platformMouseEvent, true);
</span><span class="cx"> 
</span><span class="cx">     if (m_resizeLayer) {
</span></span></pre>
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