Move information about strict provider geometry type check on point shapefiles

to OGR provider and make use of it when pasting & merging features
(fixes #12488, refs #10672, refs #10747)

TODO: check if other OGR drivers have similar restrictions.

Author: jef-n

src/app/qgisapp.cpp

@@ -6296,12 +6296,13 @@ void QgisApp::editPaste( QgsMapLayer *destinationLayer )
       // convert geometry to match destination layer
       QGis::GeometryType destType = pasteVectorLayer->geometryType();
       bool destIsMulti = QGis::isMultiType( pasteVectorLayer->wkbType() );
-      if ( pasteVectorLayer->storageType() == "ESRI Shapefile" && destType != QGis::Point )
+      if ( pasteVectorLayer->dataProvider() &&
+           !pasteVectorLayer->dataProvider()->doesStrictFeatureTypeCheck() )
       {
-        // force destination to multi if shapefile if it's not a point file
-        // Should we really force anything here?  Isn't it better to just transform?
+        // force destination to multi if provider doesn't do a feature strict check
         destIsMulti = true;
       }
+
       if ( destType != QGis::UnknownGeometry )
       {
         QgsGeometry* newGeometry = featureIt->constGeometry()->convertToType( destType, destIsMulti );

src/providers/ogr/qgsogrprovider.cpp

@@ -2530,6 +2530,12 @@ void QgsOgrProvider::recalculateFeatureCount()
   QgsOgrConnPool::instance()->invalidateConnections( filePath() );
 }
 
+bool QgsOgrProvider::doesStrictFeatureTypeCheck() const
+{
+  // FIXME probably other drivers too...
+  return ogrDriverName != "ESRI Shapefile" || geomType == wkbPoint;
+}
+
 OGRwkbGeometryType QgsOgrProvider::ogrWkbSingleFlatten( OGRwkbGeometryType type )
 {
   type = wkbFlatten( type );

src/providers/ogr/qgsogrprovider.h

@@ -243,9 +243,9 @@ class QgsOgrProvider : public QgsVectorDataProvider
     QString description() const override;
 
     /** Returns true if the provider is strict about the type of inserted features
-          (e.g. no multipolygon in a polygon layer)
-          */
-    virtual bool doesStrictFeatureTypeCheck() const override { return false;}
+        (e.g. no multipolygon in a polygon layer)
+      */
+    virtual bool doesStrictFeatureTypeCheck() const override;
 
     /** return OGR geometry type */
     static OGRwkbGeometryType getOgrGeomType( OGRLayerH ogrLayer );