Comment 10 for bug 1553804

Now I have observed the SEGV three times in a row(!!!) in a very similar context:

 - Fire up Pcbnew with the kicad_pcb file (attached in #9 of this thread).
 - Locate U7. Two traces (nets: SDA and SCL) go down from this chip using two vias pairs.
 - Take the lower vias pair and shove it down to make room for another horizontal trace.
 - Try to move the horizontal trace (net: DEBUG) down.
 - See that it is made up of three segments. Move the segments to the same level.
 - Click Edit → Cleanup Tracks and Vias to merge them.
 - Try to move the DEBUG-trace to verify that it has been fused.
 - Bang! SEGV!