[core] Graph: Remove selectedViewpoint property

The information that this property conveys will be accessible at an upper
level and is thus redundant here.

meshroom/core/graph.py

@@ -226,8 +226,6 @@ class Graph(BaseObject):
         self._fileDateVersion = 0
         self.header = {}
 
-        self._selectedViewpoint = None
-
     def clear(self):
         self.header.clear()
         self._compatibilityNodes.clear()
@@ -1566,12 +1564,6 @@ class Graph(BaseObject):
         self.updateStatusFromCache(force=True)
         self.cacheDirChanged.emit()
 
-    @property
-    def selectedViewpoint(self):
-        """ Return the attribute describing the viewpoint that is
-        currently set as the 'selected viewpoint'. """
-        return self._selectedViewpoint
-
     @property
     def fileDateVersion(self):
         return self._fileDateVersion

meshroom/ui/reconstruction.py

@@ -1158,7 +1158,6 @@ class Reconstruction(UIGraph):
             # Reconstruction has ownership of Viewpoint object - destroy it when not needed anymore
             self._selectedViewpoint.deleteLater()
         self._selectedViewpoint = ViewpointWrapper(viewpointAttribute, self) if viewpointAttribute else None
-        self._graph._selectedViewpoint = self._selectedViewpoint.attribute if viewpointAttribute else None
         self.selectedViewpointChanged.emit()
 
     def setPickedViewId(self, viewId):