Properly shrink stretched flexbox children on relayout

Source/core/rendering/RenderFlexibleBox.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 73 matching lines @@
     // Use an inline capacity of 8, since flexbox containers usually have less than 8 children.
     typedef Vector<LayoutRect, 8> ChildFrameRects;
 
     bool hasOrthogonalFlow(RenderBox* child) const;
     bool isColumnFlow() const;
     bool isLeftToRightFlow() const;
     bool isMultiline() const;
     Length flexBasisForChild(RenderBox* child) const;
     void setCrossAxisExtent(LayoutUnit);
     LayoutUnit crossAxisExtentForChild(RenderBox* child) const;
+    LayoutUnit crossAxisIntrinsicExtentForChild(RenderBox* child) const;
+    LayoutUnit childIntrinsicHeight(RenderBox* child) const;
+    LayoutUnit childIntrinsicWidth(RenderBox* child) const;
     LayoutUnit mainAxisExtentForChild(RenderBox* child) const;
     LayoutUnit crossAxisExtent() const;
     LayoutUnit mainAxisExtent() const;
     LayoutUnit crossAxisContentExtent() const;
     LayoutUnit mainAxisContentExtent(LayoutUnit contentLogicalHeight);
     LayoutUnit computeMainAxisExtentForChild(RenderBox* child, SizeType, const Length& size);
     WritingMode transformedWritingMode() const;
     LayoutUnit flowAwareBorderStart() const;
     LayoutUnit flowAwareBorderEnd() const;
     LayoutUnit flowAwareBorderBefore() const;
@@ skipping 10 matching lines @@
     LayoutUnit crossAxisScrollbarExtent() const;
     LayoutPoint flowAwareLocationForChild(RenderBox* child) const;
     // FIXME: Supporting layout deltas.
     void setFlowAwareLocationForChild(RenderBox* child, const LayoutPoint&);
     void adjustAlignmentForChild(RenderBox* child, LayoutUnit);
     ItemPosition alignmentForChild(RenderBox* child) const;
     LayoutUnit mainAxisBorderAndPaddingExtentForChild(RenderBox* child) const;
     LayoutUnit mainAxisScrollbarExtentForChild(RenderBox* child) const;
     LayoutUnit preferredMainAxisContentExtentForChild(RenderBox* child, bool hasInfiniteLineLength, bool relayoutChildren = false);
     bool childPreferredMainAxisContentExtentRequiresLayout(RenderBox* child, bool hasInfiniteLineLength) const;
+    bool needToStretchChildLogicalHeight(RenderBox* child) const;
 
     void layoutFlexItems(bool relayoutChildren);
     LayoutUnit autoMarginOffsetInMainAxis(const OrderedFlexItemList&, LayoutUnit& availableFreeSpace);
     void updateAutoMarginsInMainAxis(RenderBox* child, LayoutUnit autoMarginOffset);
     bool hasAutoMarginsInCrossAxis(RenderBox* child) const;
     bool updateAutoMarginsInCrossAxis(RenderBox* child, LayoutUnit availableAlignmentSpace);
     void repositionLogicalHeightDependentFlexItems(Vector<LineContext>&);
     LayoutUnit clientLogicalBottomAfterRepositioning();
     void appendChildFrameRects(ChildFrameRects&);
     void repaintChildrenDuringLayoutIfMoved(const ChildFrameRects&);
 
     LayoutUnit availableAlignmentSpaceForChild(LayoutUnit lineCrossAxisExtent, RenderBox*);
+    LayoutUnit availableAlignmentSpaceForChildBeforeStretching(LayoutUnit lineCrossAxisExtent, RenderBox*);
     LayoutUnit marginBoxAscentForChild(RenderBox*);
 
     LayoutUnit computeChildMarginValue(Length margin);
     void prepareOrderIteratorAndMargins();
     LayoutUnit adjustChildSizeForMinAndMax(RenderBox*, LayoutUnit childSize);
     // The hypothetical main size of an item is the flex base size clamped according to its min and max main size properties
     bool computeNextFlexLine(OrderedFlexItemList& orderedChildren, LayoutUnit& sumFlexBaseSize, double& totalFlexGrow, double& totalWeightedFlexShrink, LayoutUnit& sumHypotheticalMainSize, bool& hasInfiniteLineLength, bool relayoutChildren);
 
     bool resolveFlexibleLengths(FlexSign, const OrderedFlexItemList&, LayoutUnit& availableFreeSpace, double& totalFlexGrow, double& totalWeightedFlexShrink, InflexibleFlexItemSize&, Vector<LayoutUnit, 16>& childSizes, bool hasInfiniteLineLength);
     void freezeViolations(const Vector<Violation>&, LayoutUnit& availableFreeSpace, double& totalFlexGrow, double& totalWeightedFlexShrink, InflexibleFlexItemSize&, bool hasInfiniteLineLength);
@@ skipping 15 matching lines @@
 
     mutable OrderIterator m_orderIterator;
     int m_numberOfInFlowChildrenOnFirstLine;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderFlexibleBox, isFlexibleBox());
 
 } // namespace WebCore
 
 #endif // RenderFlexibleBox_h