GraphWidget: Fix problem with multilevel layouts

src/graph_tool/draw/gtk_draw.py

@@ -312,8 +312,12 @@ class GraphWidget(Gtk.DrawingArea):
             self.g = self.cg
             self.pos = self.cpos
             self.layout_step = self.layout_K
+            self.selected = self.g.own_property(self.selected)
+            self.highlight = self.g.own_property(self.highlight)
+            self.sel_edge_filt = self.g.own_property(self.sel_edge_filt)
         else:
             self.cg = None
+
         if update_layout:
             self.reset_layout()
 
@@ -421,6 +425,9 @@ class GraphWidget(Gtk.DrawingArea):
                     self.layout_K *= 0.75
                     self.g = self.cg
                     self.pos = self.cpos
+                    self.selected = self.g.own_property(self.selected)
+                    self.highlight = self.g.own_property(self.highlight)
+                    self.sel_edge_filt = self.g.own_property(self.sel_edge_filt)
                     self.layout_step = max(self.layout_K,
                                            _avg_edge_distance(self.g,
                                                               self.pos) / 10)
@@ -436,6 +443,9 @@ class GraphWidget(Gtk.DrawingArea):
                 except StopIteration:
                     self.g = self.ag
                     self.pos = self.apos
+                    self.selected = self.g.own_property(self.selected)
+                    self.highlight = self.g.own_property(self.highlight)
+                    self.sel_edge_filt = self.g.own_property(self.sel_edge_filt)
                     self.g.copy_property(self.cpos, self.pos)
                     if self.vertex_matrix is not None:
                         self.vertex_matrix = VertexMatrix(self.g, self.pos)