removed recursion

window.cpp

@@ -106,8 +106,7 @@ void Window::solveButtonClicked()
                 hist.back()->collapsedCellClicked();
                 hist.pop_back();
             }
-            solveButtonClicked();
-            return;
+            continue;
         }
 
         int rndCell = rand() % b.size(); // choose a random cell