Properly shrink stretched flexbox children on relayout

Source/core/html/shadow/SliderThumbElement.cpp

Index: Source/core/html/shadow/SliderThumbElement.cpp
diff --git a/Source/core/html/shadow/SliderThumbElement.cpp b/Source/core/html/shadow/SliderThumbElement.cpp
index 093f36cc057f5f825545647822edcc3d8cd039a1..cf325559f43976be2a113cce15f3a30df9ab2820 100644
--- a/Source/core/html/shadow/SliderThumbElement.cpp
+++ b/Source/core/html/shadow/SliderThumbElement.cpp
@@ -128,11 +128,18 @@ void RenderSliderContainer::computeLogicalHeight(LayoutUnit logicalHeight, Layou
         if (zoomFactor != 1.0)
             trackHeight *= zoomFactor;
 
+        // FIXME: The trackHeight should have been added before updateLogicalHeight was called to avoid this hack.
+        updateIntrinsicContentLogicalHeight(trackHeight);
+
         RenderBox::computeLogicalHeight(trackHeight, logicalTop, computedValues);
         return;
     }
     if (isVertical)
         logicalHeight = RenderSlider::defaultTrackLength;
+
+    // FIXME: The trackHeight should have been added before updateLogicalHeight was called to avoid this hack.
+    updateIntrinsicContentLogicalHeight(logicalHeight);
+
     RenderBox::computeLogicalHeight(logicalHeight, logicalTop, computedValues);
 }