- when the selection is changed in the Project Tree the selection shape on canvas is deleted

- if an object is selected on Project Tree and it does not have the selection shape drawn, first click on canvas over it will draw the selection shape

ObjectCollection.py

@@ -787,6 +787,11 @@ class ObjectCollection(QtCore.QAbstractItemModel):
         # FlatCAMApp.App.log.debug("Current: %s, Previous %s" % (str(current), str(previous)))
 
         try:
+            # delete selection shape
+            self.app.delete_selection_shape()
+            for o in self.get_list():
+                o.selection_shape_drawn = False
+
             obj = current.indexes()[0].internalPointer().obj
             self.item_selected.emit(obj.options['name'])