Use a maximum expanded width when using Coloquinte expansion

Author: Coloquinte

etesian/src/EtesianEngine.cpp

@@ -1046,7 +1046,8 @@ namespace Etesian {
 
     // Apply changes to match target density variation; we add a small margin to be safer
     float rowSideMarginInCellHeight = 0.3;
-    _circuit->expandCellsToDensity(1.0 - getDensityVariation(), rowSideMarginInCellHeight);
+    float maxExpansionInRowWidth = 1.0 / 8.0;
+    _circuit->expandCellsToDensity(1.0 - getDensityVariation(), rowSideMarginInCellHeight, maxExpansionInRowWidth);
 
     _circuit->check();
     _placementLB = new coloquinte::PlacementSolution ();