Issue:Dirty edge option crashes program

Description:	program crash
Extension / Version:	aiSee   /   2.2
Type / Status:	Bug   /   open

Problem

Drawing three edges between the same nodes with "dirty_edges" = on crashes the program.

graph: {
dirtyedgelabels: yes
displayedgelabels: yes
node: { title: "B" label: "B" }
node: { title: "A" label: "A" }
edge: { source: "A" target: "B" label: "a normal label" }
edge: { source: "A" target: "B" label: "a label which is
a little bit longer
than normal" }
edge: { source: "A" target: "B" label: "another label of
some length" }
}