TemplateTrack: Add test function for supported file name

TemplateTrack no longer supports anything but GPX. The new function
leverages this property for TemplateTrack compatibility in OgrTemplate
without capturing the details in OgrTemplate.

src/gdal/ogr_template.cpp

@@ -19,15 +19,11 @@
 
 #include "ogr_template.h"
 
-#include <algorithm>
-#include <iosfwd>
-#include <iterator>
 #include <memory>
 #include <utility>
 
 #include <Qt>
 #include <QtGlobal>
-#include <QByteArray>
 #include <QDialog>
 #include <QLatin1String>
 #include <QPoint>
@@ -214,6 +210,7 @@ std::unique_ptr<Georeferencing> OgrTemplate::makeGeoreferencing(const QString& s
 bool OgrTemplate::preLoadSetup(QWidget* dialog_parent)
 try
 {
+	template_track_compatibility = TemplateTrack::supports(template_path);
 	is_georeferenced = false;
 	explicit_georef.reset();
 	map_configuration_georef.reset();
@@ -222,14 +219,6 @@ try
 	transform = {};
 	updateTransformationMatrices();
 
-	auto ends_with_any_of = [](const QString& path, const std::vector<QByteArray>& list) -> bool {
-		using namespace std;
-		return any_of(begin(list), end(list), [path](const QByteArray& extension) {
-			return path.endsWith(QLatin1String(extension), Qt::CaseInsensitive);
-		} );
-	};
-	template_track_compatibility = ends_with_any_of(template_path, TemplateTrack::supportedExtensions());
-
 	auto data_georef = std::unique_ptr<Georeferencing>();
 	if (map->getGeoreferencing().getState() != Georeferencing::Geospatial)
 	{

src/templates/template_track.cpp

@@ -148,6 +148,12 @@ const std::vector<QByteArray>& TemplateTrack::supportedExtensions()
 	return extensions;
 }
 
+bool TemplateTrack::supports(const QString& filename)
+{
+	return filename.endsWith(QLatin1String(".gpx"), Qt::CaseInsensitive);
+}
+
+
 TemplateTrack::TemplateTrack(const QString& path, Map* map)
  : Template(path, map)
 {

src/templates/template_track.h

@@ -46,16 +46,29 @@ class Georeferencing;
 class Map;
 
 
-/** A template consisting of a set of tracks (polylines) and waypoints */
+/**
+ * A template class for visualizing of GPX files.
+ * 
+ * This class offers specialized support for visualizing tracks and waypoints
+ * from GPX files.
+ */
 class TemplateTrack : public Template
 {
 Q_OBJECT
 public:
 	/**
 	 * Returns the filename extensions supported by this template class.
+	 * 
+	 * Class TemplateTrack only supports ".gpx".
 	 */
 	static const std::vector<QByteArray>& supportedExtensions();
 
+	/**
+	 * Tests if a filename ends with the supported extension, ".gpx".
+	 */
+	static bool supports(const QString& filename);
+
+
 	TemplateTrack(const QString& path, Map* map);
 protected:
 	TemplateTrack(const TemplateTrack& proto);