Spec-compliant parsing and initial values for 'orphans' and 'widows'.

third_party/WebKit/Source/core/layout/ColumnBalancer.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/ColumnBalancer.h"
 
 #include "core/layout/LayoutMultiColumnFlowThread.h"
 #include "core/layout/LayoutMultiColumnSet.h"
 #include "core/layout/api/LineLayoutBlockFlow.h"
 
@@ skipping 121 matching lines @@
 }
 
 void InitialColumnHeightFinder::examineBoxBeforeLeaving(const LayoutBox& box)
 {
 }
 
 static inline LayoutUnit columnLogicalHeightRequirementForLine(const ComputedStyle& style, const RootInlineBox& lastLine)
 {
     // We may require a certain minimum number of lines per page in order to satisfy
     // orphans and widows, and that may affect the minimum page height.
-    unsigned minimumLineCount = std::max<unsigned>(style.hasAutoOrphans() ? 1 : style.orphans(), style.widows());
+    unsigned minimumLineCount = std::max<unsigned>(style.orphans(), style.widows());
     const RootInlineBox* firstLine = &lastLine;
     for (unsigned i = 1; i < minimumLineCount && firstLine->prevRootBox(); i++)
         firstLine = firstLine->prevRootBox();
     return lastLine.lineBottomWithLeading() - firstLine->lineTopWithLeading();
 }
 
 void InitialColumnHeightFinder::examineLine(const RootInlineBox& line)
 {
     LayoutUnit lineTop = line.lineTopWithLeading();
     LayoutUnit lineTopInFlowThread = flowThreadOffset() + lineTop;
@@ skipping 182 matching lines @@
     // of said overflow ends up in the next column. That counts as space shortage.
     const MultiColumnFragmentainerGroup& group = groupAtOffset(lineTopInFlowThread);
     LayoutUnit lineBottomWithOverflow = lineTopInFlowThread + line.lineBottom() - lineTop;
     if (group.columnLogicalTopForOffset(lineTopInFlowThread) != group.columnLogicalTopForOffset(lineBottomWithOverflow)) {
         LayoutUnit shortage = lineBottomWithOverflow - group.columnLogicalTopForOffset(lineBottomWithOverflow);
         recordSpaceShortage(shortage);
     }
 }
 
 } // namespace blink