Respect break-inside:avoid on table rows

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 4689 matching lines @@
 }
 
 void LayoutBox::clearPercentHeightDescendants()
 {
     for (LayoutObject* curr = slowFirstChild(); curr; curr = curr->nextInPreOrder(this)) {
         if (curr->isBox())
             toLayoutBox(curr)->removeFromPercentHeightContainer();
     }
 }
 
+LayoutUnit LayoutBox::pageLogicalHeightForOffset(LayoutUnit offset) const
+{
+    LayoutView* layoutView = view();
+    LayoutFlowThread* flowThread = flowThreadContainingBlock();
+    if (!flowThread)
+        return layoutView->layoutState()->pageLogicalHeight();
+    return flowThread->pageLogicalHeightForOffset(offset + offsetFromLogicalTopOfFirstPage());
+}
+
+LayoutUnit LayoutBox::pageRemainingLogicalHeightForOffset(LayoutUnit offset, PageBoundaryRule pageBoundaryRule) const
+{
+    LayoutView* layoutView = view();
+    offset += offsetFromLogicalTopOfFirstPage();
+
+    LayoutFlowThread* flowThread = flowThreadContainingBlock();
+    if (!flowThread) {
+        LayoutUnit pageLogicalHeight = layoutView->layoutState()->pageLogicalHeight();
+        LayoutUnit remainingHeight = pageLogicalHeight - intMod(offset, pageLogicalHeight);
+        if (pageBoundaryRule == AssociateWithFormerPage) {
+            // An offset exactly at a page boundary will act as being part of the former page in
+            // question (i.e. no remaining space), rather than being part of the latter (i.e. one
+            // whole page length of remaining space).
+            remainingHeight = intMod(remainingHeight, pageLogicalHeight);
+        }
+        return remainingHeight;
+    }
+
+    return flowThread->pageRemainingLogicalHeightForOffset(offset, pageBoundaryRule);
+}
+
+LayoutUnit LayoutBox::calculatePaginationStrutToFitContent(LayoutUnit offset, LayoutUnit strutToNextPage, LayoutUnit contentLogicalHeight) const
+{
+    ASSERT(strutToNextPage == pageRemainingLogicalHeightForOffset(offset, AssociateWithLatterPage));
+    LayoutUnit nextPageLogicalTop = offset + strutToNextPage;
+    if (pageLogicalHeightForOffset(nextPageLogicalTop) >= contentLogicalHeight)
+        return strutToNextPage; // Content fits just fine in the next page or column.
+
+    // Moving to the top of the next page or column doesn't result in enough space for the content
+    // that we're trying to fit. If we're in a nested fragmentation context, we may find enough
+    // space if we move to a column further ahead, by effectively breaking to the next outer
+    // fragmentainer.
+    LayoutFlowThread* flowThread = flowThreadContainingBlock();
+    if (!flowThread) {
+        // If there's no flow thread, we're not nested. All pages have the same height. Give up.
+        return strutToNextPage;
+    }
+    // Start searching for a suitable offset at the top of the next page or column.
+    LayoutUnit flowThreadOffset = offsetFromLogicalTopOfFirstPage() + nextPageLogicalTop;
+    return strutToNextPage + flowThread->nextLogicalTopForUnbreakableContent(flowThreadOffset, contentLogicalHeight) - flowThreadOffset;
+}
+
 } // namespace blink