Adjust snapping options on layer change

src/gui/qgsmaptooladvanceddigitizing.cpp

@@ -25,6 +25,7 @@ QgsMapToolAdvancedDigitizing::QgsMapToolAdvancedDigitizing( QgsMapCanvas *canvas
   : QgsMapToolEdit( canvas )
   , mCadDockWidget( cadDockWidget )
 {
+  connect( canvas, &QgsMapCanvas::currentLayerChanged, this, &QgsMapToolAdvancedDigitizing::onCurrentLayerChanged );
 }
 
 void QgsMapToolAdvancedDigitizing::canvasPressEvent( QgsMapMouseEvent *e )
@@ -143,6 +144,20 @@ void QgsMapToolAdvancedDigitizing::cadPointChanged( const QgsPointXY &point )
   qApp->postEvent( mCanvas->viewport(), ev );  // event queue will delete the event when processed
 }
 
+void QgsMapToolAdvancedDigitizing::onCurrentLayerChanged()
+{
+  QgsVectorLayer *layer = currentVectorLayer();
+  if ( mSnapToGridCanvasItem && layer && mSnapToGridEnabled )
+  {
+    mSnapToGridCanvasItem->setPrecision( layer->geometryFixes()->geometryPrecision() );
+    mSnapToGridCanvasItem->setCrs( layer->crs() );
+    mSnapToGridCanvasItem->setEnabled( true );
+  }
+
+  if ( !layer )
+    mSnapToGridCanvasItem->setEnabled( false );
+}
+
 bool QgsMapToolAdvancedDigitizing::snapToGridEnabled() const
 {
   return mSnapToGridEnabled;

src/gui/qgsmaptooladvanceddigitizing.h

@@ -167,6 +167,8 @@ class GUI_EXPORT QgsMapToolAdvancedDigitizing : public QgsMapToolEdit
      */
     void cadPointChanged( const QgsPointXY &point );
 
+    void onCurrentLayerChanged();
+
   private:
     QgsAdvancedDigitizingDockWidget *mCadDockWidget = nullptr;