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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/211942">211942</a></dd>
<dt>Author</dt> <dd>carlosgc@webkit.org</dd>
<dt>Date</dt> <dd>2017-02-09 00:56:15 -0800 (Thu, 09 Feb 2017)</dd>
</dl>
<h3>Log Message</h3>
<pre>Merge <a href="http://trac.webkit.org/projects/webkit/changeset/210120">r210120</a> - Do not destroy the RenderNamedFlowFragment as leftover anonymous block.
https://bugs.webkit.org/show_bug.cgi?id=166436
rdar://problem/29772233
Reviewed by Simon Fraser.
Source/WebCore:
When as the result of certain style change, the generated anonymous block is not needed anymore, we
move its descendants up to the parent and destroy the generated box. While RenderNamedFlowFragment is a generated
block, the cleanup code should just ignore it the same way we ignore boxes like multicolumn, mathml etc.
Test: fast/regions/flow-fragment-as-anonymous-block-crash.html
* rendering/RenderObject.h:
(WebCore::RenderObject::isAnonymousBlock):
LayoutTests:
* fast/regions/flow-fragment-as-anonymous-block-crash-expected.txt: Added.
* fast/regions/flow-fragment-as-anonymous-block-crash.html: Added.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#releasesWebKitGTKwebkit214LayoutTestsChangeLog">releases/WebKitGTK/webkit-2.14/LayoutTests/ChangeLog</a></li>
<li><a href="#releasesWebKitGTKwebkit214SourceWebCoreChangeLog">releases/WebKitGTK/webkit-2.14/Source/WebCore/ChangeLog</a></li>
<li><a href="#releasesWebKitGTKwebkit214SourceWebCorerenderingRenderObjecth">releases/WebKitGTK/webkit-2.14/Source/WebCore/rendering/RenderObject.h</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#releasesWebKitGTKwebkit214LayoutTestsfastregionsflowfragmentasanonymousblockcrashexpectedtxt">releases/WebKitGTK/webkit-2.14/LayoutTests/fast/regions/flow-fragment-as-anonymous-block-crash-expected.txt</a></li>
<li><a href="#releasesWebKitGTKwebkit214LayoutTestsfastregionsflowfragmentasanonymousblockcrashhtml">releases/WebKitGTK/webkit-2.14/LayoutTests/fast/regions/flow-fragment-as-anonymous-block-crash.html</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="releasesWebKitGTKwebkit214LayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.14/LayoutTests/ChangeLog (211941 => 211942)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.14/LayoutTests/ChangeLog 2017-02-09 08:56:03 UTC (rev 211941)
+++ releases/WebKitGTK/webkit-2.14/LayoutTests/ChangeLog 2017-02-09 08:56:15 UTC (rev 211942)
</span><span class="lines">@@ -1,3 +1,14 @@
</span><ins>+2016-12-22 Zalan Bujtas <zalan@apple.com>
+
+ Do not destroy the RenderNamedFlowFragment as leftover anonymous block.
+ https://bugs.webkit.org/show_bug.cgi?id=166436
+ rdar://problem/29772233
+
+ Reviewed by Simon Fraser.
+
+ * fast/regions/flow-fragment-as-anonymous-block-crash-expected.txt: Added.
+ * fast/regions/flow-fragment-as-anonymous-block-crash.html: Added.
+
</ins><span class="cx"> 2016-12-16 Zalan Bujtas <zalan@apple.com>
</span><span class="cx">
</span><span class="cx"> Defer certain accessibility callbacks until after layout is finished.
</span></span></pre></div>
<a id="releasesWebKitGTKwebkit214LayoutTestsfastregionsflowfragmentasanonymousblockcrashexpectedtxt"></a>
<div class="addfile"><h4>Added: releases/WebKitGTK/webkit-2.14/LayoutTests/fast/regions/flow-fragment-as-anonymous-block-crash-expected.txt (0 => 211942)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.14/LayoutTests/fast/regions/flow-fragment-as-anonymous-block-crash-expected.txt (rev 0)
+++ releases/WebKitGTK/webkit-2.14/LayoutTests/fast/regions/flow-fragment-as-anonymous-block-crash-expected.txt 2017-02-09 08:56:15 UTC (rev 211942)
</span><span class="lines">@@ -0,0 +1,2 @@
</span><ins>+PASS if no crash or assert.
+
</ins></span></pre></div>
<a id="releasesWebKitGTKwebkit214LayoutTestsfastregionsflowfragmentasanonymousblockcrashhtml"></a>
<div class="addfile"><h4>Added: releases/WebKitGTK/webkit-2.14/LayoutTests/fast/regions/flow-fragment-as-anonymous-block-crash.html (0 => 211942)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.14/LayoutTests/fast/regions/flow-fragment-as-anonymous-block-crash.html (rev 0)
+++ releases/WebKitGTK/webkit-2.14/LayoutTests/fast/regions/flow-fragment-as-anonymous-block-crash.html 2017-02-09 08:56:15 UTC (rev 211942)
</span><span class="lines">@@ -0,0 +1,31 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<title>This tests that we don't destroy the fragment anonymous block while cleaning up the render tree.</title>
+<style>
+li {
+ -webkit-flow-from: foobar;
+}
+
+q {
+ display: list-item;
+ -webkit-flow-from: foobar;
+}
+
+.fuzz0::before{
+ display: block;
+}
+</style>
+</head>
+<body>
+PASS if no crash or assert.
+<li></li><q></q>
+<script>
+if (window.testRunner)
+ testRunner.dumpAsText();
+document.body.offsetHeight;
+document.getElementsByTagName("q")[0].className = "fuzz0";
+document.body.offsetHeight;
+</script>
+</body>
+</html>
</ins></span></pre></div>
<a id="releasesWebKitGTKwebkit214SourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.14/Source/WebCore/ChangeLog (211941 => 211942)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.14/Source/WebCore/ChangeLog 2017-02-09 08:56:03 UTC (rev 211941)
+++ releases/WebKitGTK/webkit-2.14/Source/WebCore/ChangeLog 2017-02-09 08:56:15 UTC (rev 211942)
</span><span class="lines">@@ -1,3 +1,20 @@
</span><ins>+2016-12-22 Zalan Bujtas <zalan@apple.com>
+
+ Do not destroy the RenderNamedFlowFragment as leftover anonymous block.
+ https://bugs.webkit.org/show_bug.cgi?id=166436
+ rdar://problem/29772233
+
+ Reviewed by Simon Fraser.
+
+ When as the result of certain style change, the generated anonymous block is not needed anymore, we
+ move its descendants up to the parent and destroy the generated box. While RenderNamedFlowFragment is a generated
+ block, the cleanup code should just ignore it the same way we ignore boxes like multicolumn, mathml etc.
+
+ Test: fast/regions/flow-fragment-as-anonymous-block-crash.html
+
+ * rendering/RenderObject.h:
+ (WebCore::RenderObject::isAnonymousBlock):
+
</ins><span class="cx"> 2016-12-16 Zalan Bujtas <zalan@apple.com>
</span><span class="cx">
</span><span class="cx"> Defer certain accessibility callbacks until after layout is finished.
</span></span></pre></div>
<a id="releasesWebKitGTKwebkit214SourceWebCorerenderingRenderObjecth"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.14/Source/WebCore/rendering/RenderObject.h (211941 => 211942)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.14/Source/WebCore/rendering/RenderObject.h 2017-02-09 08:56:03 UTC (rev 211941)
+++ releases/WebKitGTK/webkit-2.14/Source/WebCore/rendering/RenderObject.h 2017-02-09 08:56:15 UTC (rev 211942)
</span><span class="lines">@@ -412,7 +412,7 @@
</span><span class="cx"> // RenderBlock::createAnonymousBlock(). This includes creating an anonymous
</span><span class="cx"> // RenderBlock having a BLOCK or BOX display. Other classes such as RenderTextFragment
</span><span class="cx"> // are not RenderBlocks and will return false. See https://bugs.webkit.org/show_bug.cgi?id=56709.
</span><del>- return isAnonymous() && (style().display() == BLOCK || style().display() == BOX) && style().styleType() == NOPSEUDO && isRenderBlock() && !isListMarker() && !isRenderFlowThread() && !isRenderMultiColumnSet() && !isRenderView()
</del><ins>+ return isAnonymous() && (style().display() == BLOCK || style().display() == BOX) && style().styleType() == NOPSEUDO && isRenderBlock() && !isListMarker() && !isRenderFlowThread() && !isRenderNamedFlowFragment() && !isRenderMultiColumnSet() && !isRenderView()
</ins><span class="cx"> #if ENABLE(FULLSCREEN_API)
</span><span class="cx"> && !isRenderFullScreen()
</span><span class="cx"> && !isRenderFullScreenPlaceholder()
</span></span></pre>
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