Properly shrink stretched flexbox children on relayout

Source/core/rendering/RenderListBox.cpp

Index: Source/core/rendering/RenderListBox.cpp
diff --git a/Source/core/rendering/RenderListBox.cpp b/Source/core/rendering/RenderListBox.cpp
index 4a5fa8f77e09ac0b0f303ce00a2278bf701b3de2..daf3816fb8df8e0337bbea9f973519385724c147 100644
--- a/Source/core/rendering/RenderListBox.cpp
+++ b/Source/core/rendering/RenderListBox.cpp
@@ -290,7 +290,12 @@ LayoutUnit RenderListBox::listHeight() const
 
 void RenderListBox::computeLogicalHeight(LayoutUnit, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const
 {
-    LayoutUnit height = itemHeight() * size() - rowSpacing + borderAndPaddingHeight();
+    LayoutUnit height = itemHeight() * size() - rowSpacing;
+    // FIXME: This height should have been added in before we got here to avoid this hack.
+    updateIntrinsicContentLogicalHeight(height);
+
+    height += borderAndPaddingHeight();
+
     RenderBox::computeLogicalHeight(height, logicalTop, computedValues);
 }