graph: Re-fetch dst_node descriptor after src_node potential removal

The graph_t::disconnect(src_node, dst_node) function removes connections
(edges) from src_node to dst_node in the graph, and then removes the
nodes (vertices) if their degree is zero after removing the connections.

Because removing a vertex from the graph invalidates vertex descriptors,
the graph_t::_remove_node() function resynchronizes the node-to-vertex
descriptor map after removing the vertex.

However, in graph_t::disconnect(), the vertex descriptor corresponding
to dst_node was not being refetched after the potential removal of
src_node, which results in the incorrect removal of innocent nodes under
certain circumstances. This commit ensures that the node-to-vertex
descriptor is reconsulted for the vertex descriptor corresponding to
dst_node before removing it from the tree.

0 files changed, 0 insertions, 0 deletions