Remove deprecated Qt version checks

Arrangement_on_surface_2/demo/Arrangement_on_surface_2/GridGraphicsItem.cpp

@@ -67,11 +67,7 @@ void GridGraphicsItem::setSpacing(int spacing_)
 static inline qreal
 horizontalAdvance(const QFontMetrics& fm, const QString& text)
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
   return fm.horizontalAdvance(text);
-#else
-  return fm.boundingRect(text).width();
-#endif
 }
 
 void GridGraphicsItem::paint(

GraphicsView/include/CGAL/Qt/qglviewer.h

@@ -478,6 +478,13 @@ public Q_SLOTS:
   qreal bufferTextureMaxU() const { return bufferTextureMaxU_; }
   /*! Same as bufferTextureMaxU(), but for the v texture coordinate. */
   qreal bufferTextureMaxV() const { return bufferTextureMaxV_; }
+  // These methods are part of the QGLWidget public API.
+  // As of version 2.7.0, the use of QOpenGLWidget instead means that they have
+  // to be provided for backward compatibility.
+  void renderText(int x, int y, const QString &str,
+                  const QFont &font = QFont());
+  void renderText(double x, double y, double z, const QString &str,
+                  const QFont &font = QFont());
 
 public Q_SLOTS:
   void copyBufferToTexture(GLint, GLenum = GL_NONE);

GraphicsView/include/CGAL/Qt/qglviewer_impl.h

@@ -720,6 +720,28 @@ CGAL_INLINE_FUNCTION
 void CGAL::QGLViewer::drawLight(GLenum, qreal ) const {
 }
 
+CGAL_INLINE_FUNCTION
+void CGAL::QGLViewer::renderText(int x, int y, const QString &str,
+                           const QFont &font) {
+  QColor fontColor = QColor(0, 0,
+                            0, 255);
+
+  // Render text
+  QPainter painter(this);
+  painter.setPen(fontColor);
+  painter.setFont(font);
+  painter.drawText(x, y, str);
+  painter.end();
+}
+
+CGAL_INLINE_FUNCTION
+void CGAL::QGLViewer::renderText(double x, double y, double z, const QString &str,
+                           const QFont &font) {
+  using CGAL::qglviewer::Vec;
+  const Vec proj = camera_->projectedCoordinatesOf(Vec(x, y, z));
+  renderText(int(proj.x), int(proj.y), str, font);
+}
+
 /*! Draws \p text at position \p x, \p y (expressed in screen coordinates
 pixels, origin in the upper left corner of the widget).
 

Lab/demo/Lab/CGAL_Lab.cpp

@@ -27,6 +27,9 @@ int& code_to_call_before_creation_of_QCoreApplication(int& i) {
   fmt.setOption(QSurfaceFormat::DebugContext);
   QSurfaceFormat::setDefaultFormat(fmt);
 
+  // for windows
+  QCoreApplication::setAttribute(Qt::AA_UseDesktopOpenGL);
+
   return i;
 }
 

Lab/demo/Lab/MainWindow.cpp

@@ -663,6 +663,12 @@ void MainWindow::loadPlugins()
     }
   }
   QString env_path = qgetenv("LAB_DEMO_PLUGINS_PATH");
+  QChar separator = QDir::listSeparator();
+  #if defined(_WIN32)
+    QChar separator = ';';
+  #else
+    QChar separator = ':';
+  #endif
   if(!env_path.isEmpty()) {
 #if defined(_WIN32)
     QString path = qgetenv("PATH");