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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/199156">199156</a></dd>
<dt>Author</dt> <dd>zalan@apple.com</dd>
<dt>Date</dt> <dd>2016-04-07 07:55:54 -0700 (Thu, 07 Apr 2016)</dd>
</dl>

<h3>Log Message</h3>
<pre>REGRESSION (197987): Ingredient lists on smittenkitchen.com are full justified instead of left justified.
https://bugs.webkit.org/show_bug.cgi?id=156326
&lt;rdar://problem/25519393&gt;

Reviewed by Antti Koivisto.

According to the spec (https://drafts.csswg.org/css-text-3/#text-align-property)
unless otherwise specified by text-align-last, the last line before
a forced break or the end of the block is start-aligned.

In this patch we check if a forced break is present and we apply text alignment accordingly.

Test: fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout.html

Source/WebCore:

* rendering/SimpleLineLayout.cpp:
(WebCore::SimpleLineLayout::LineState::lastFragment): Make it optional so that we don't just check against a default fragment.
(WebCore::SimpleLineLayout::createLineRuns):
(WebCore::SimpleLineLayout::justifyRuns): Do not compute first run index on the current line twice.
(WebCore::SimpleLineLayout::textAlignForLine):
(WebCore::SimpleLineLayout::closeLineEndingAndAdjustRuns):

LayoutTests:

* fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout-expected.html: Added.
* fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout.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="#trunkSourceWebCorerenderingSimpleLineLayoutcpp">trunk/Source/WebCore/rendering/SimpleLineLayout.cpp</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfastcss3textcss3textjustifytextjustifylastlinesimplelinelayoutexpectedhtml">trunk/LayoutTests/fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout-expected.html</a></li>
<li><a href="#trunkLayoutTestsfastcss3textcss3textjustifytextjustifylastlinesimplelinelayouthtml">trunk/LayoutTests/fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout.html</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (199155 => 199156)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog        2016-04-07 14:22:11 UTC (rev 199155)
+++ trunk/LayoutTests/ChangeLog        2016-04-07 14:55:54 UTC (rev 199156)
</span><span class="lines">@@ -1,3 +1,22 @@
</span><ins>+2016-04-07  Zalan Bujtas  &lt;zalan@apple.com&gt;
+
+        REGRESSION (197987): Ingredient lists on smittenkitchen.com are full justified instead of left justified.
+        https://bugs.webkit.org/show_bug.cgi?id=156326
+        &lt;rdar://problem/25519393&gt;
+
+        Reviewed by Antti Koivisto.
+
+        According to the spec (https://drafts.csswg.org/css-text-3/#text-align-property) 
+        unless otherwise specified by text-align-last, the last line before
+        a forced break or the end of the block is start-aligned.
+
+        In this patch we check if a forced break is present and we apply text alignment accordingly.
+
+        Test: fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout.html
+
+        * fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout-expected.html: Added.
+        * fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout.html: Added.
+
</ins><span class="cx"> 2016-04-07  Antti Koivisto  &lt;antti@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         Shadow DOM: Implement display: contents for slots
</span></span></pre></div>
<a id="trunkLayoutTestsfastcss3textcss3textjustifytextjustifylastlinesimplelinelayoutexpectedhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout-expected.html (0 => 199156)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout-expected.html                                (rev 0)
+++ trunk/LayoutTests/fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout-expected.html        2016-04-07 14:55:54 UTC (rev 199156)
</span><span class="lines">@@ -0,0 +1,28 @@
</span><ins>+&lt;!DOCTYPE html&gt;
+&lt;html&gt;
+&lt;head&gt;
+&lt;title&gt;This tests that ignore text-align: justify for last lines.&lt;/title&gt;
+&lt;style&gt;
+div {
+    display: inline-block;
+    border: 1px solid green;
+    text-align: justify;
+    margin-left: 10px;
+}
+&lt;/style&gt;
+&lt;/head&gt;
+&lt;body&gt;
+&lt;script&gt;
+if (window.internals)
+    internals.settings.setSimpleLineLayoutEnabled(false);
+var width = 50;
+var content = &quot;Lo rem ip&lt;br&gt;sum do lor&lt;br&gt;sit a met, con sec te tur&lt;br&gt;ad ip is cing el it&lt;br&gt;sed do e i us mod tempor.&quot;;
+for (var i = 0; i &lt; 20; ++i, width += 5) {
+    var element = document.createElement(&quot;div&quot;);
+    element.style.width = width + &quot;px&quot;;
+    element.innerHTML = content;
+    document.body.appendChild(element);
+}
+&lt;/script&gt;
+&lt;/body&gt;
+&lt;/html&gt;
</ins></span></pre></div>
<a id="trunkLayoutTestsfastcss3textcss3textjustifytextjustifylastlinesimplelinelayouthtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout.html (0 => 199156)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout.html                                (rev 0)
+++ trunk/LayoutTests/fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout.html        2016-04-07 14:55:54 UTC (rev 199156)
</span><span class="lines">@@ -0,0 +1,26 @@
</span><ins>+&lt;!DOCTYPE html&gt;
+&lt;html&gt;
+&lt;head&gt;
+&lt;title&gt;This tests that ignore text-align: justify for last lines.&lt;/title&gt;
+&lt;style&gt;
+div {
+    display: inline-block;
+    border: 1px solid green;
+    text-align: justify;
+    margin-left: 10px;
+}
+&lt;/style&gt;
+&lt;/head&gt;
+&lt;body&gt;
+&lt;script&gt;
+var width = 50;
+var content = &quot;Lo rem ip&lt;br&gt;sum do lor&lt;br&gt;sit a met, con sec te tur&lt;br&gt;ad ip is cing el it&lt;br&gt;sed do e i us mod tempor.&quot;;
+for (var i = 0; i &lt; 20; ++i, width += 5) {
+    var element = document.createElement(&quot;div&quot;);
+    element.style.width = width + &quot;px&quot;;
+    element.innerHTML = content;
+    document.body.appendChild(element);
+}
+&lt;/script&gt;
+&lt;/body&gt;
+&lt;/html&gt;
</ins></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (199155 => 199156)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2016-04-07 14:22:11 UTC (rev 199155)
+++ trunk/Source/WebCore/ChangeLog        2016-04-07 14:55:54 UTC (rev 199156)
</span><span class="lines">@@ -1,3 +1,26 @@
</span><ins>+2016-04-07  Zalan Bujtas  &lt;zalan@apple.com&gt;
+
+        REGRESSION (197987): Ingredient lists on smittenkitchen.com are full justified instead of left justified.
+        https://bugs.webkit.org/show_bug.cgi?id=156326
+        &lt;rdar://problem/25519393&gt;
+
+        Reviewed by Antti Koivisto.
+
+        According to the spec (https://drafts.csswg.org/css-text-3/#text-align-property) 
+        unless otherwise specified by text-align-last, the last line before
+        a forced break or the end of the block is start-aligned.
+
+        In this patch we check if a forced break is present and we apply text alignment accordingly.
+
+        Test: fast/css3-text/css3-text-justify/text-justify-last-line-simple-line-layout.html
+
+        * rendering/SimpleLineLayout.cpp:
+        (WebCore::SimpleLineLayout::LineState::lastFragment): Make it optional so that we don't just check against a default fragment.
+        (WebCore::SimpleLineLayout::createLineRuns):
+        (WebCore::SimpleLineLayout::justifyRuns): Do not compute first run index on the current line twice.
+        (WebCore::SimpleLineLayout::textAlignForLine):
+        (WebCore::SimpleLineLayout::closeLineEndingAndAdjustRuns):
+
</ins><span class="cx"> 2016-04-07  Antti Koivisto  &lt;antti@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         FrameView::qualifiesAsVisuallyNonEmpty() returns false when loading a Google search results page before search results are loaded, even though the header is visible
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingSimpleLineLayoutcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/SimpleLineLayout.cpp (199155 => 199156)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/SimpleLineLayout.cpp        2016-04-07 14:22:11 UTC (rev 199155)
+++ trunk/Source/WebCore/rendering/SimpleLineLayout.cpp        2016-04-07 14:55:54 UTC (rev 199156)
</span><span class="lines">@@ -402,7 +402,12 @@
</span><span class="cx">     float logicalLeftOffset() const { return m_logicalLeftOffset; }
</span><span class="cx">     const TextFragmentIterator::TextFragment&amp; overflowedFragment() const { return m_overflowedFragment; }
</span><span class="cx">     bool hasTrailingWhitespace() const { return m_trailingWhitespaceLength; }
</span><del>-    TextFragmentIterator::TextFragment lastFragment() const { return m_fragments.last(); }
</del><ins>+    Optional&lt;TextFragmentIterator::TextFragment&gt; lastFragment() const
+    {
+        if (m_fragments.size())
+            return m_fragments.last();
+        return Nullopt;
+    }
</ins><span class="cx">     bool isWhitespaceOnly() const { return m_trailingWhitespaceWidth &amp;&amp; m_runsWidth == m_trailingWhitespaceWidth; }
</span><span class="cx">     bool fits(float extra) const { return m_availableWidth &gt;= m_runsWidth + extra; }
</span><span class="cx">     bool firstCharacterFits() const { return m_firstCharacterFits; }
</span><span class="lines">@@ -733,7 +738,8 @@
</span><span class="cx">                 break;
</span><span class="cx">             }
</span><span class="cx">             // Non-breakable non-whitespace fragment when there's already content on the line. Push it to the next line.
</span><del>-            if (line.lastFragment().overlapsToNextRenderer()) {
</del><ins>+            ASSERT(line.lastFragment());
+            if (line.lastFragment().value().overlapsToNextRenderer()) {
</ins><span class="cx">                 // Check if this fragment is a continuation of a previous segment. In such cases, we need to remove them all.
</span><span class="cx">                 const auto&amp; lastCompleteFragment = line.revertToLastCompleteFragment(runs);
</span><span class="cx">                 textFragmentIterator.revertToEndOfFragment(lastCompleteFragment);
</span><span class="lines">@@ -757,14 +763,13 @@
</span><span class="cx">     return expansionBehavior;
</span><span class="cx"> }
</span><span class="cx"> 
</span><del>-static void justifyRuns(const LineState&amp; line, Layout::RunVector&amp; runs, Optional&lt;unsigned&gt; lastRunIndexOfPreviousLine)
</del><ins>+static void justifyRuns(const LineState&amp; line, Layout::RunVector&amp; runs, unsigned firstRunIndex)
</ins><span class="cx"> {
</span><span class="cx">     ASSERT(runs.size());
</span><span class="cx">     auto widthToDistribute = line.availableWidth() - line.width();
</span><span class="cx">     if (widthToDistribute &lt;= 0)
</span><span class="cx">         return;
</span><span class="cx"> 
</span><del>-    auto firstRunIndex = lastRunIndexOfPreviousLine ? lastRunIndexOfPreviousLine.value() + 1 : 0;
</del><span class="cx">     auto lastRunIndex = runs.size() - 1;
</span><span class="cx">     ASSERT(firstRunIndex &lt;= lastRunIndex);
</span><span class="cx">     Vector&lt;std::pair&lt;unsigned, ExpansionBehavior&gt;&gt; expansionOpportunityList;
</span><span class="lines">@@ -794,8 +799,17 @@
</span><span class="cx">     }
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+static ETextAlign textAlignForLine(const TextFragmentIterator::Style&amp; style, bool lastLine)
+{
+    // Fallback to LEFT (START) alignment for non-collapsable content and for the last line before a forced break or the end of the block.
+    auto textAlign = style.textAlign;
+    if (textAlign == JUSTIFY &amp;&amp; (!style.collapseWhitespace || lastLine))
+        textAlign = LEFT;
+    return textAlign;
+}
+
</ins><span class="cx"> static void closeLineEndingAndAdjustRuns(LineState&amp; line, Layout::RunVector&amp; runs, Optional&lt;unsigned&gt; lastRunIndexOfPreviousLine, unsigned&amp; lineCount,
</span><del>-    const TextFragmentIterator&amp; textFragmentIterator, bool lastLine)
</del><ins>+    const TextFragmentIterator&amp; textFragmentIterator, bool lastLineInFlow)
</ins><span class="cx"> {
</span><span class="cx">     if (!runs.size() || (lastRunIndexOfPreviousLine &amp;&amp; runs.size() - 1 == lastRunIndexOfPreviousLine.value()))
</span><span class="cx">         return;
</span><span class="lines">@@ -804,17 +818,13 @@
</span><span class="cx">         return;
</span><span class="cx">     // Adjust runs' position by taking line's alignment into account.
</span><span class="cx">     const auto&amp; style = textFragmentIterator.style();
</span><del>-    auto textAlign = style.textAlign;
-    // Fallback to LEFT alignment both for non-collapsable content and for the last line.
-    if (textAlign == JUSTIFY &amp;&amp; (!style.collapseWhitespace || lastLine))
-        textAlign = LEFT;
-
</del><ins>+    auto firstRunIndex = lastRunIndexOfPreviousLine ? lastRunIndexOfPreviousLine.value() + 1 : 0;
</ins><span class="cx">     auto lineLogicalLeft = line.logicalLeftOffset();
</span><ins>+    auto textAlign = textAlignForLine(style, lastLineInFlow || (line.lastFragment() &amp;&amp; line.lastFragment().value().type() == TextFragmentIterator::TextFragment::HardLineBreak));
</ins><span class="cx">     if (textAlign == JUSTIFY)
</span><del>-        justifyRuns(line, runs, lastRunIndexOfPreviousLine);
</del><ins>+        justifyRuns(line, runs, firstRunIndex);
</ins><span class="cx">     else
</span><span class="cx">         lineLogicalLeft = computeLineLeft(textAlign, line.availableWidth(), line.width(), line.logicalLeftOffset());
</span><del>-    auto firstRunIndex = lastRunIndexOfPreviousLine ? lastRunIndexOfPreviousLine.value() + 1 : 0;
</del><span class="cx">     for (auto i = firstRunIndex; i &lt; runs.size(); ++i) {
</span><span class="cx">         runs[i].logicalLeft += lineLogicalLeft;
</span><span class="cx">         runs[i].logicalRight += lineLogicalLeft;
</span></span></pre>
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