I have the impression that when in the main QGis Canvas only a geometry (with QgsMapTool / QgsVectorLayer) is being changed, only the geometry is being refreshed and not the underlining Rasters (which have not changed).
I would like to know how this is done since I am working with an adapted Georeferencer with QgsMapTool / QgsVectorLayer for the points, where when the Pixel-Point is moved in the Georeferencer-MapCanvas both the geometry and the Raster are being refreshed, which when multiple points need to be moved is quite time consuming. I have looked through the QgisApp, QgsMapTool, QgsMapLayer/QgsVectorLayer classes but I fail to see what is being done differently. If an hint could be given where this done, I would be grateful. Mark Johnson
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