Number: 1959
Title: Constraint / Subgraph
Submitter: X
Date: Sat May 22 09:49:23 2010
Subsys: Dot
Version: 2.26.3
System: *-*-
Severity: major
Problem:
There might be a possible bug when a "box" is part of two unconstrained relations and one relation(edge) leads into another subgraph, the edge between the two subgraphs is doubled.

Here are two simple examples: 


==================================================================
===[ incorrect ]==================================================
==================================================================
Digraph g {


  node [shape=box];


subgraph cluster1 {
  label="X";
  A;
  B;
  C;
}
subgraph cluster0 {
  label="Y";
  Q;
}
  C->B [constraint=false];
  A->B [constraint=false];
  A->Q [constraint=false];
}


==================================================================
===[ correct ]====================================================
==================================================================


Digraph g {


  node [shape=box];


subgraph cluster1 {
  label="X";
  A;
  B;
  C;
}
subgraph cluster0 {
  label="Y";
  Q;
}
  C->B [constraint=false];
  A->B;
  A->Q [constraint=false];
}

I reported that possible bug once before, but now I figured out a possible reason.

Hope this helps.
Owner: *
Status: *