[Browser] Fix invalid detection of OGR VRT by GDAL provider, and fix broken detection of OGR VRT (fixes #16806)

Author: rouault

src/providers/gdal/qgsgdaldataitems.cpp

@@ -273,13 +273,13 @@ QGISEXTERN QgsDataItem *dataItem( QString path, QgsDataItem *parentItem )
       // do not print errors, but write to debug
       CPLPushErrorHandler( CPLQuietErrorHandler );
       CPLErrorReset();
-      if ( ! GDALIdentifyDriver( path.toUtf8().constData(), nullptr ) )
+      GDALDriverH hDriver = GDALIdentifyDriver( path.toUtf8().constData(), nullptr );
+      CPLPopErrorHandler();
+      if ( !hDriver || GDALGetDriverShortName( hDriver ) == QLatin1String( "OGR_VRT" ) )
       {
         QgsDebugMsgLevel( "Skipping VRT file because root is not a GDAL VRT", 2 );
-        CPLPopErrorHandler();
         return nullptr;
       }
-      CPLPopErrorHandler();
     }
     // add the item
     QStringList sublayers;

src/providers/ogr/qgsogrdataitems.cpp

@@ -592,21 +592,14 @@ QGISEXTERN QgsDataItem *dataItem( QString path, QgsDataItem *parentItem )
     // if this is a VRT file make sure it is vector VRT to avoid duplicates
     if ( suffix == QLatin1String( "vrt" ) )
     {
-      GDALDriverH hDriver = GDALGetDriverByName( "OGR_VRT" );
-      if ( hDriver )
+      CPLPushErrorHandler( CPLQuietErrorHandler );
+      CPLErrorReset();
+      GDALDriverH hDriver = GDALIdentifyDriver( path.toUtf8().constData(), nullptr );
+      CPLPopErrorHandler();
+      if ( !hDriver || GDALGetDriverShortName( hDriver ) == QLatin1String( "VRT" ) )
       {
-        // do not print errors, but write to debug
-        CPLPushErrorHandler( CPLQuietErrorHandler );
-        CPLErrorReset();
-        GDALDatasetH hDataSource = GDALOpenEx(
-                                     path.toLocal8Bit().constData(), GDAL_OF_VECTOR, nullptr, nullptr, nullptr );
-        CPLPopErrorHandler();
-        if ( ! hDataSource )
-        {
-          QgsDebugMsgLevel( "Skipping VRT file because root is not a OGR VRT", 2 );
-          return nullptr;
-        }
-        GDALClose( hDataSource );
+        QgsDebugMsgLevel( "Skipping VRT file because root is not a OGR VRT", 2 );
+        return nullptr;
       }
     }
     // Handle collections

src/providers/ogr/qgsogrprovider.cpp

@@ -2403,7 +2403,7 @@ QString createFilters( const QString &type )
       {
         sDirectoryDrivers += QObject::tr( "U.S. Census TIGER/Line" ) + ",TIGER;";
       }
-      else if ( driverName.startsWith( QLatin1String( "VRT" ) ) )
+      else if ( driverName.startsWith( QLatin1String( "OGR_VRT" ) ) )
       {
         sFileFilters += createFileFilter_( QObject::tr( "VRT - Virtual Datasource" ),
                                            QStringLiteral( "*.vrt *.ovf" ) );