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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/243503">243503</a></dd>
<dt>Author</dt> <dd>zalan@apple.com</dd>
<dt>Date</dt> <dd>2019-03-26 10:27:05 -0700 (Tue, 26 Mar 2019)</dd>
</dl>

<h3>Log Message</h3>
<pre>[ContentChangeObserver] Skip anonymous renderers when checking for "willRespondToMouseClickEvents"
https://bugs.webkit.org/show_bug.cgi?id=196259
<rdar://problem/49240029>

Reviewed by Dean Jackson.

Source/WebCore:

Anonymous renderers don't have associated DOM nodes so they can't have event listeners either. Let's skip them.

Test: fast/events/touch/ios/content-observation/crash-on-anonymous-renderer.html

* page/ios/ContentChangeObserver.cpp:
(WebCore::ContentChangeObserver::StyleChangeScope::isConsideredClickable const):

LayoutTests:

* fast/events/touch/ios/content-observation/crash-on-anonymous-renderer-expected.txt: Added.
* fast/events/touch/ios/content-observation/crash-on-anonymous-renderer.html: Added.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorepageiosContentChangeObservercpp">trunk/Source/WebCore/page/ios/ContentChangeObserver.cpp</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfasteventstouchioscontentobservationcrashonanonymousrendererexpectedtxt">trunk/LayoutTests/fast/events/touch/ios/content-observation/crash-on-anonymous-renderer-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfasteventstouchioscontentobservationcrashonanonymousrendererhtml">trunk/LayoutTests/fast/events/touch/ios/content-observation/crash-on-anonymous-renderer.html</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (243502 => 243503)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog      2019-03-26 17:13:30 UTC (rev 243502)
+++ trunk/LayoutTests/ChangeLog 2019-03-26 17:27:05 UTC (rev 243503)
</span><span class="lines">@@ -1,3 +1,14 @@
</span><ins>+2019-03-26  Zalan Bujtas  <zalan@apple.com>
+
+        [ContentChangeObserver] Skip anonymous renderers when checking for "willRespondToMouseClickEvents"
+        https://bugs.webkit.org/show_bug.cgi?id=196259
+        <rdar://problem/49240029>
+
+        Reviewed by Dean Jackson.
+
+        * fast/events/touch/ios/content-observation/crash-on-anonymous-renderer-expected.txt: Added.
+        * fast/events/touch/ios/content-observation/crash-on-anonymous-renderer.html: Added.
+
</ins><span class="cx"> 2019-03-26  Shawn Roberts  <sroberts@apple.com>
</span><span class="cx"> 
</span><span class="cx">         Layout tests fast/events/wheel-event-destroys-overflow.html 
</span></span></pre></div>
<a id="trunkLayoutTestsfasteventstouchioscontentobservationcrashonanonymousrendererexpectedtxt"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/events/touch/ios/content-observation/crash-on-anonymous-renderer-expected.txt (0 => 243503)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/events/touch/ios/content-observation/crash-on-anonymous-renderer-expected.txt                             (rev 0)
+++ trunk/LayoutTests/fast/events/touch/ios/content-observation/crash-on-anonymous-renderer-expected.txt        2019-03-26 17:27:05 UTC (rev 243503)
</span><span class="lines">@@ -0,0 +1,3 @@
</span><ins>+PASS if no crash.
+inline text with
+text inside block
</ins></span></pre></div>
<a id="trunkLayoutTestsfasteventstouchioscontentobservationcrashonanonymousrendererhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/events/touch/ios/content-observation/crash-on-anonymous-renderer.html (0 => 243503)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/events/touch/ios/content-observation/crash-on-anonymous-renderer.html                             (rev 0)
+++ trunk/LayoutTests/fast/events/touch/ios/content-observation/crash-on-anonymous-renderer.html        2019-03-26 17:27:05 UTC (rev 243503)
</span><span class="lines">@@ -0,0 +1,54 @@
</span><ins>+<html>
+<head>
+<title>This tests the case when visible content has anonymous renderers.</title>
+<script src="../../../../../resources/basic-gestures.js"></script>
+<style>
+#tapthis {
+    width: 400px;
+    height: 400px;
+    border: 1px solid green;
+}
+
+#becomesVisible {
+    position: absolute;
+    left: -1000px;
+    width: 100px;
+    height: 100px;
+    background-color: green;
+}
+</style>
+<script>
+async function test() {
+    if (!window.testRunner || !testRunner.runUIScript)
+        return;
+    if (window.internals)
+        internals.settings.setContentChangeObserverEnabled(true);
+
+    testRunner.waitUntilDone();
+    testRunner.dumpAsText();
+
+    let rect = tapthis.getBoundingClientRect();
+    let x = rect.left + rect.width / 2;
+    let y = rect.top + rect.height / 2;
+
+    await tapAtPoint(x, y);
+}
+</script>
+</head>
+<body onload="test()">
+<div id=tapthis>PASS if no crash.</div>
+<div id=becomesVisible>inline text with <div>text inside block</div></div>
+<script>
+tapthis.addEventListener("mousemove", function( event ) {
+    becomesVisible.style.left = "100px";
+    document.body.offsetHeight;
+    if (window.testRunner)
+        testRunner.notifyDone();
+}, false);
+
+tapthis.addEventListener("click", function( event ) {   
+    result.innerHTML = "clicked";
+}, false);
+</script>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (243502 => 243503)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog   2019-03-26 17:13:30 UTC (rev 243502)
+++ trunk/Source/WebCore/ChangeLog      2019-03-26 17:27:05 UTC (rev 243503)
</span><span class="lines">@@ -1,3 +1,18 @@
</span><ins>+2019-03-26  Zalan Bujtas  <zalan@apple.com>
+
+        [ContentChangeObserver] Skip anonymous renderers when checking for "willRespondToMouseClickEvents"
+        https://bugs.webkit.org/show_bug.cgi?id=196259
+        <rdar://problem/49240029>
+
+        Reviewed by Dean Jackson.
+
+        Anonymous renderers don't have associated DOM nodes so they can't have event listeners either. Let's skip them.
+
+        Test: fast/events/touch/ios/content-observation/crash-on-anonymous-renderer.html
+
+        * page/ios/ContentChangeObserver.cpp:
+        (WebCore::ContentChangeObserver::StyleChangeScope::isConsideredClickable const):
+
</ins><span class="cx"> 2019-03-26  Antoine Quint  <graouts@apple.com>
</span><span class="cx"> 
</span><span class="cx">         Remove mousemoveEventHandlingPreventsDefault internal setting and quirk
</span></span></pre></div>
<a id="trunkSourceWebCorepageiosContentChangeObservercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/page/ios/ContentChangeObserver.cpp (243502 => 243503)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/page/ios/ContentChangeObserver.cpp  2019-03-26 17:13:30 UTC (rev 243502)
+++ trunk/Source/WebCore/page/ios/ContentChangeObserver.cpp     2019-03-26 17:27:05 UTC (rev 243503)
</span><span class="lines">@@ -502,6 +502,8 @@
</span><span class="cx">     // In case when the visible content already had renderers it's not sufficient to check the "newly visible" element only since it might just be the container for the clickable content.  
</span><span class="cx">     ASSERT(m_element.renderer());
</span><span class="cx">     for (auto& descendant : descendantsOfType<RenderElement>(*element.renderer())) {
</span><ins>+        if (!descendant.element())
+            continue;
</ins><span class="cx">         if (descendant.element()->willRespondToMouseClickEvents())
</span><span class="cx">             return true;
</span><span class="cx">     }
</span></span></pre>
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