- readXml() does not resolve layers from the layer IDs anymore. Call resolveReferences() or use readXml() override with QgsProject as the second argument.

QgsLayerTreeModel {#qgis_api_break_3_0_QgsLayerTreeMode}

-----------------

- setProgress() signal has been removed. It was not emitted since 2.0.

- enableOverviewMode() and updateOverview() have been removed. Map canvas does not keep pointer to overview canvas anymore. Use QgsLayerTreeMapCanvasBridge::setOverviewCanvas() to set up updates of overview canvas together with main canvas.

- the duplicate mapToolSet signal with a single QgsMapTool argument has been removed. Use the signal with arguments for new and old map tool instead.

QgsMapCanvasItem {#qgis_api_break_3_0_QgsMapCanvasItem}

----------------

- layerSet() and setLayerSet() have been replaced by layers() and setLayers() which work with list of layers instead of layer IDs

- destinationSrsChanged() was renamed to destinationCrsChanged()

QgsMapRenderer {#qgis_api_break_3_0_QgsMapRenderer}

be returned instead of a null pointer if no transformation is required.

- destinationCrs() now returns a copy instead of a reference to the CRS. This has no effect on PyQGIS code, but c++

plugins calling this method will need to be updated.

QgsMarkerSymbolLayer {#qgis_api_break_3_0_QgsMarkerSymbolLayer}

- The MapUnits UnitType was removed. Use LayerUnits or ProjectUnits instead.

QgsTreeWidgetItem {#qgis_api_break_3_0_QgsTreeWidgetItem}

-----------------

*/

void setCustomRenderFlags( const QString& customRenderFlags );

//! sets destination coordinate reference system

void setDestinationCrs( const QgsCoordinateReferenceSystem& crs );

//! returns CRS of destination coordinate reference system