When disconnecting one of two pieces of conducting equipment which are connected to the same corner of a bus bar (removing the "connection dot" on the line), the feeder line from the remaining connected conducting equipment gets merged into the bus bar line section, thereby making it appear thick. This way bus bars can be constructed that turn arbitrary corners, which disturbs the algorithm for moving and resizing bus bars.
When disconnecting one of two pieces of conducting equipment which are connected to the same corner of a bus bar (removing the "connection dot" on the line), the feeder line from the remaining connected conducting equipment gets merged into the bus bar line section, thereby making it appear thick. This way bus bars can be constructed that turn arbitrary corners, which disturbs the algorithm for moving and resizing bus bars.