Don't add layers without x/y/z movement to gcview

printrun/gl/libtatlin/actors.py

@@ -277,9 +277,14 @@ class GcodeModel(Model):
 
         prev_pos = (0, 0, 0)
         for layer_idx, layer in enumerate(model_data.all_layers):
+            has_movement = False
             for gline in layer:
                 if not gline.is_move:
                     continue
+                if gline.x is not None \
+                   or gline.y is not None \
+                   or gline.z is not None:
+                    has_movement = True
                 current_pos = (gline.current_x, gline.current_y, gline.current_z)
                 if not gline.extruding:
                     travel_vertex_list.append(prev_pos)
@@ -301,7 +306,8 @@ class GcodeModel(Model):
                 count_print_vertices.append(len(vertex_list))
                 gline.gcview_end_vertex = len(count_print_indices) - 1
 
-            self.layer_stops.append(len(count_print_indices) - 1)
+            if has_movement:
+                self.layer_stops.append(len(count_print_indices) - 1)
 
             if callback:
                 callback(layer_idx + 1, num_layers)