Address problems in last test suite run

https://cgal.geometryfactory.com/CGAL/testsuite/results-5.2-Ic-11.shtml#Arrangement_on_surface_2_Demo

Arrangement_on_surface_2/demo/Arrangement_on_surface_2/ArrangementDemoTab.cpp

@@ -30,9 +30,8 @@
 #include <CGAL/Qt/GraphicsViewNavigation.h>
 
 #include <QGridLayout>
+#include <limits>
 
-static constexpr double MAX_WIDTH =
-  std::numeric_limits<double>::max() / 1048576;
 
 ArrangementDemoTabBase::ArrangementDemoTabBase( QWidget* parent ) :
   QWidget( parent ),
@@ -59,6 +58,8 @@ void ArrangementDemoTabBase::setupUi( )
   this->layout->addWidget( this->graphicsView, 0, 0 );
   this->graphicsView->setScene( scene );
 
+  double MAX_WIDTH = std::numeric_limits<double>::max() / 1048576;
+
   double xymin = -MAX_WIDTH / 2;
   double wh = MAX_WIDTH;
   scene->setSceneRect(xymin, xymin, wh, wh);
@@ -435,8 +436,8 @@ static bool isFinite(const CGAL::Bbox_2& box)
 static CGAL::Bbox_2 addMargins(const CGAL::Bbox_2& box)
 {
   // add margin to bounding box
-  float x_margin;
-  float y_margin;
+  double x_margin;
+  double y_margin;
   if (box.xmin() == box.xmax() || box.ymin() == box.ymax())
   {
     static constexpr float const_margin = 50;
@@ -445,7 +446,7 @@ static CGAL::Bbox_2 addMargins(const CGAL::Bbox_2& box)
   }
   else
   {
-    static constexpr float prop_margin = 0.10;
+    static constexpr double prop_margin = 0.10;
     x_margin = (box.xmax() - box.xmin()) * prop_margin;
     y_margin = (box.ymax() - box.ymin()) * prop_margin;
   }

Arrangement_on_surface_2/demo/Arrangement_on_surface_2/ArrangementDemoWindow.cpp

@@ -28,6 +28,7 @@
 #include <QMessageBox>
 #include <QString>
 #include <QGraphicsView>
+#include <QLabel>
 
 #include <CGAL/Qt/GraphicsViewNavigation.h>
 

Arrangement_on_surface_2/demo/Arrangement_on_surface_2/ArrangementPainterOstream.cpp

@@ -11,7 +11,10 @@
 
 #include "ArrangementPainterOstream.h"
 #include "ArrangementTypes.h"
+
+#ifdef CGAL_USE_CORE
 #include <CGAL/Curved_kernel_via_analysis_2/Curve_renderer_facade.h>
+#endif
 
 #include <QGraphicsView>
 
@@ -262,7 +265,8 @@ ArrangementPainterOstream<CGAL::Arr_Bezier_curve_traits_2<
 
   std::vector<std::pair<double, double>> sampled_points;
   // TODO: get adaptive number of samples
-  size_t number_of_samples = 100 * (param_range.second - param_range.first);
+  unsigned int number_of_samples =
+    100 * (param_range.second - param_range.first);
   sampled_points.reserve(number_of_samples);
 
   supporting_curve.sample(
@@ -397,6 +401,7 @@ auto ArrangementPainterOstream<CGAL::Arr_algebraic_segment_traits_2<
   Coefficient_>>::getPointsList(const X_monotone_curve_2& curve)
   -> std::vector<Coord_vec_2>
 {
+#ifdef CGAL_USE_CORE
   typedef Curve_renderer_facade<CKvA_2> Facade;
   typedef std::pair<double, double> Coord_2;
   typedef std::vector<Coord_2> Coord_vec_2;
@@ -404,6 +409,9 @@ auto ArrangementPainterOstream<CGAL::Arr_algebraic_segment_traits_2<
   std::vector<Coord_vec_2> points;
   Facade::instance().draw(curve, points);
   return points;
+#else
+  return {};
+#endif
 }
 
 template <typename Coefficient_>
@@ -447,11 +455,13 @@ template <typename Coefficient_>
 void ArrangementPainterOstream<
   CGAL::Arr_algebraic_segment_traits_2<Coefficient_>>::setupFacade()
 {
+#ifdef CGAL_USE_CORE
   typedef Curve_renderer_facade<CKvA_2> Facade;
   QGraphicsView* view = this->getView();
   QRectF viewport = this->viewportRect();
   CGAL::Bbox_2 bbox = this->convert(viewport).bbox();
   Facade::setup(bbox, view->width(), view->height());
+#endif
 }
 
 // Instantiation of Arr_rational_function_traits_2

Arrangement_on_surface_2/demo/Arrangement_on_surface_2/ConstructBoundingBox.cpp

@@ -54,7 +54,7 @@ struct ConstructBoundingBox_impl
       bbox = inf_bbox;
     }
 #ifdef CGAL_USE_CORE
-    catch (Zero_resultant_exception& ex)
+    catch (Zero_resultant_exception&)
     {
       std::cerr << "Exception thrown of type \"Zero_resultant_exception\"\n";
       std::cerr << __FILE__ << ':' << __LINE__ << '\n';