dia.LinkView: fix perpendicular links when source/target element not visible in the paper or having negative coordinates (#398)
dia.LinkView: fix perpendicular links when source/target element not visible in the paper or having negative coordinates (#398)


vtalas/joint,clientIO/joint,vtalas/joint,DavidDurman/joint,clientIO/joint,kumilingus/joint,DavidDurman/joint,chill117/joint,clientIO/joint,chill117/joint,vtalas/joint,kumilingus/joint,gagaboy/joint,clientIO/joint,gagaboy/joint,kumilingus/joint,chill117/joint,DavidDurman/joint,gagaboy/joint,kumilingus/joint