dia.Paper: ensure defs before viewport (#831)
dia.Paper: ensure defs before viewport (#831)


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