allow to drop 2dm files from system file browser (#8987)

* allow to drop 2dm files from system file browser
* support non-ascii files for mesh layer

Author: PeterPetrik

src/app/qgisapp.cpp

@@ -6471,6 +6471,12 @@ bool QgisApp::openLayer( const QString &fileName, bool allowInteractive )
 
   CPLPopErrorHandler();
 
+  // Try to load as mesh layer after raster & vector
+  if ( !ok )
+  {
+    ok = addMeshLayer( fileName, fileInfo.completeBaseName(), "mdal" );
+  }
+
   if ( !ok )
   {
     // we have no idea what this file is...

src/providers/mdal/qgsmdalprovider.cpp

@@ -54,7 +54,7 @@ QgsCoordinateReferenceSystem QgsMdalProvider::crs() const
 QgsMdalProvider::QgsMdalProvider( const QString &uri, const ProviderOptions &options )
   : QgsMeshDataProvider( uri, options )
 {
-  QByteArray curi = uri.toAscii();
+  QByteArray curi = uri.toUtf8();
   mMeshH = MDAL_LoadMesh( curi.constData() );
   if ( mMeshH )
   {

tests/src/providers/CMakeLists.txt

@@ -9,6 +9,7 @@ INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}
   ${CMAKE_SOURCE_DIR}/src/core/auth
   ${CMAKE_SOURCE_DIR}/src/core/expression
   ${CMAKE_SOURCE_DIR}/src/core/geometry
+  ${CMAKE_SOURCE_DIR}/src/core/mesh
   ${CMAKE_SOURCE_DIR}/src/core/metadata
   ${CMAKE_SOURCE_DIR}/src/core/raster
   ${CMAKE_SOURCE_DIR}/src/core/symbology

tests/src/providers/testqgsmdalprovider.cpp

@@ -27,6 +27,7 @@
 #include <qgis.h>
 #include <qgsapplication.h>
 #include <qgsproviderregistry.h>
+#include <qgsmeshdataprovider.h>
 
 /**
  * \ingroup UnitTests
@@ -42,6 +43,7 @@ class TestQgsMdalProvider : public QObject
     void init() {}// will be called before each testfunction is executed.
     void cleanup() {}// will be called after every testfunction.
 
+    void load();
     void filters();
 
   private:
@@ -83,5 +85,36 @@ void TestQgsMdalProvider::filters()
   QVERIFY( datasetFilters.contains( "*.dat" ) );
 }
 
+
+void TestQgsMdalProvider::load()
+{
+  {
+    QString file = QStringLiteral( TEST_DATA_DIR ) + "/mesh/quad_flower.2dm";
+    QgsDataProvider *provider = QgsProviderRegistry::instance()->createProvider(
+                                  QStringLiteral( "mdal" ),
+                                  file,
+                                  QgsDataProvider::ProviderOptions()
+                                );
+
+    QgsMeshDataProvider *mp = dynamic_cast< QgsMeshDataProvider * >( provider );
+    QVERIFY( mp );
+    QVERIFY( mp->isValid() );
+    delete provider;
+  }
+  {
+    QString file = QStringLiteral( TEST_DATA_DIR ) + QStringLiteral( "/goodluckwiththisfilename.2dm" );
+    QgsDataProvider *provider = QgsProviderRegistry::instance()->createProvider(
+                                  QStringLiteral( "mdal" ),
+                                  file,
+                                  QgsDataProvider::ProviderOptions()
+                                );
+
+    QgsMeshDataProvider *mp = dynamic_cast< QgsMeshDataProvider * >( provider );
+    QVERIFY( mp );
+    QVERIFY( !mp->isValid() );
+    delete provider;
+  }
+}
+
 QGSTEST_MAIN( TestQgsMdalProvider )
 #include "testqgsmdalprovider.moc"