#pragma once for our headers plus drive-by formatting

rtgui/previewhandler.h

@@ -16,19 +16,18 @@
  *  You should have received a copy of the GNU General Public License
  *  along with RawTherapee.  If not, see <https://www.gnu.org/licenses/>.
  */
-#ifndef _PREVIEWHANDLER_
-#define _PREVIEWHANDLER_
+#pragma once
 
 #include <list>
 #include <memory>
 
 #include <gtkmm.h>
 
-#include "threadutils.h"
 #include "guiutils.h"
+#include "threadutils.h"
 
-#include "../rtengine/rtengine.h"
 #include "../rtengine/noncopyable.h"
+#include "../rtengine/rtengine.h"
 
 class PreviewListener
 {
@@ -86,5 +85,3 @@ public:
     Glib::RefPtr<Gdk::Pixbuf>           getRoughImage (int desiredW, int desiredH, double& zoom);
     rtengine::procparams::CropParams    getCropParams ();
 };
-
-#endif