Ensure both attribute table cache & master model request respect

geometry fetching

If request needs geometry but cache isn't fetching it then cache
is bypassed. This is a performance hit, so ensure that cache
and request are always in sync wrt to fetching geoms.

On behalf of Faunalia, sponsored by ENEL

python/core/qgsvectorlayercache.sip

@@ -33,19 +33,10 @@ class QgsVectorLayerCache : QObject
      */
     int cacheSize();
 
-    /**
-     * Enable or disable the caching of geometries
-     *
-     * @param cacheGeometry    Enable or disable the caching of geometries
-     */
     void setCacheGeometry( bool cacheGeometry );
 
+    bool cacheGeometry() const;
 
-    /**
-     * Set the subset of attributes to be cached
-     *
-     * @param attributes   The attributes to be cached
-     */
     void setCacheSubsetOfAttributes( const QgsAttributeList& attributes );
 
     /**

src/core/qgsvectorlayercache.h

@@ -106,9 +106,16 @@ class CORE_EXPORT QgsVectorLayerCache : public QObject
      * Enable or disable the caching of geometries
      *
      * @param cacheGeometry    Enable or disable the caching of geometries
+     * @see cacheGeometry()
      */
     void setCacheGeometry( bool cacheGeometry );
 
+    /**
+     * Returns true if the cache will fetch and cache feature geometries.
+     * @note added in QGIS 3.0
+     * @see setCacheGeometry()
+     */
+    bool cacheGeometry() const { return mCacheGeometry; }
 
     /**
      * Set the subset of attributes to be cached

src/gui/attributetable/qgsdualview.cpp

@@ -82,7 +82,7 @@ void QgsDualView::init( QgsVectorLayer *layer, QgsMapCanvas *mapCanvas, const Qg
   connect( mTableView->horizontalHeader(), &QHeaderView::customContextMenuRequested, this, &QgsDualView::showViewHeaderMenu );
   connect( mTableView, &QgsAttributeTableView::columnResized, this, &QgsDualView::tableColumnResized );
 
-  initLayerCache( !request.filterRect().isNull() );
+  initLayerCache( !( request.flags() & QgsFeatureRequest::NoGeometry ) || !request.filterRect().isNull() );
   initModels( mapCanvas, request );
 
   mConditionalFormatWidget->setLayer( mLayer );

tests/src/gui/testqgsdualview.cpp

@@ -56,6 +56,7 @@ class TestQgsDualView : public QObject
     void testSort();
 
     void testAttributeFormSharedValueScanning();
+    void testNoGeom();
 
   private:
     QgsMapCanvas *mCanvas = nullptr;
@@ -270,5 +271,35 @@ void TestQgsDualView::testAttributeFormSharedValueScanning()
   QVERIFY( mixedValueFields.isEmpty() );
 }
 
+void TestQgsDualView::testNoGeom()
+{
+  //test that both the master model and cache for the dual view either both request geom or both don't request geom
+  std::unique_ptr< QgsDualView > dv( new QgsDualView() );
+
+  // request with geometry
+  QgsFeatureRequest req;
+  dv->init( mPointsLayer, mCanvas, req );
+  // check that both master model AND cache are using geometry
+  QgsAttributeTableModel* model = dv->masterModel();
+  QVERIFY( model->layerCache()->cacheGeometry() );
+  QVERIFY( !( model->request().flags() & QgsFeatureRequest::NoGeometry ) );
+
+  // request with NO geometry, but using filter rect (which should override and request geom)
+  req = QgsFeatureRequest().setFilterRect( QgsRectangle( 1, 2, 3, 4 ) );
+  dv.reset( new QgsDualView() );
+  dv->init( mPointsLayer, mCanvas, req );
+  model = dv->masterModel();
+  QVERIFY( model->layerCache()->cacheGeometry() );
+  QVERIFY( !( model->request().flags() & QgsFeatureRequest::NoGeometry ) );
+
+  // request with NO geometry
+  req = QgsFeatureRequest().setFlags( QgsFeatureRequest::NoGeometry );
+  dv.reset( new QgsDualView() );
+  dv->init( mPointsLayer, mCanvas, req );
+  model = dv->masterModel();
+  QVERIFY( !model->layerCache()->cacheGeometry() );
+  QVERIFY(( model->request().flags() & QgsFeatureRequest::NoGeometry ) );
+}
+
 QGSTEST_MAIN( TestQgsDualView )
 #include "testqgsdualview.moc"