Update layout map to use transform context

Author: nyalldawson

src/core/layout/qgslayoutitemmap.cpp

@@ -1498,7 +1498,7 @@ QPointF QgsLayoutItemMap::layoutMapPosForItem( const QgsAnnotation *annotation )
   {
     //need to reproject
     // todo datum nyall set context
-    QgsCoordinateTransform t( annotationCrs, crs() );
+    QgsCoordinateTransform t( annotationCrs, crs(), mLayout->project() );
     double z = 0.0;
     try
     {

src/core/layout/qgslayoutitemmapgrid.cpp

@@ -2294,7 +2294,7 @@ int QgsLayoutItemMapGrid::crsGridParams( QgsRectangle &crsRect, QgsCoordinateTra
 
   try
   {
-    QgsCoordinateTransform tr( mMap->crs(), mCRS );
+    QgsCoordinateTransform tr( mMap->crs(), mCRS, mLayout->project() );
     QPolygonF mapPolygon = mMap->transformedMapPolygon();
     QRectF mbr = mapPolygon.boundingRect();
     QgsRectangle mapBoundingRect( mbr.left(), mbr.bottom(), mbr.right(), mbr.top() );

src/core/layout/qgslayoutitemmapoverview.cpp

@@ -70,7 +70,7 @@ void QgsLayoutItemMapOverview::draw( QPainter *painter )
 
     // reproject extent
     QgsCoordinateTransform ct( overviewFrameMap->crs(),
-                               mMap->crs() );
+                               mMap->crs(), mLayout->project() );
     g = g.densifyByCount( 20 );
     try
     {