[New Multicolumn] Give up on stretching columns if they have already reached max height.

Source/core/layout/MultiColumnFragmentainerGroup.cpp

Index: Source/core/layout/MultiColumnFragmentainerGroup.cpp
diff --git a/Source/core/layout/MultiColumnFragmentainerGroup.cpp b/Source/core/layout/MultiColumnFragmentainerGroup.cpp
index 54cd8bb2c3f7d110cec522fd9b07de710cf512fc..42182d48114ab066d248a33e1a8fad9a89fe013f 100644
--- a/Source/core/layout/MultiColumnFragmentainerGroup.cpp
+++ b/Source/core/layout/MultiColumnFragmentainerGroup.cpp
@@ -420,6 +420,13 @@ LayoutUnit MultiColumnFragmentainerGroup::calculateColumnHeight(BalancedColumnHe
         return m_columnHeight;
     }
 
+    if (m_columnHeight >= m_maxColumnHeight) {
+        // We cannot stretch any further. We'll just have to live with the overflowing columns. This
+        // typically happens if the max column height is less than the height of the tallest piece
+        // of unbreakable content (e.g. lines).
+        return m_columnHeight;
+    }
+
     // If the initial guessed column height wasn't enough, stretch it now. Stretch by the lowest
     // amount of space shortage found during layout.