DiagramGrid: Decide how to place the outstanding vertex of the welded triangle.
DiagramGrid: Decide how to place the outstanding vertex of the welded triangle.

While _find_triangle_welding shows how to place one edge of the
triangle, it is important and nontrivial to decide where to place the
third vertex.  DiagramGrid is now capable to make this decision, while
also fixing some possible degenerate situations in the fringe.

ga7g08/sympy,MridulS/sympy,wyom/sympy,meghana1995/sympy,cccfran/sympy,saurabhjn76/sympy,flacjacket/sympy,kaushik94/sympy,yukoba/sympy,emon10005/sympy,yashsharan/sympy,wanglongqi/sympy,ChristinaZografou/sympy,souravsingh/sympy,ChristinaZografou/sympy,dqnykamp/sympy,mcdaniel67/sympy,chaffra/sympy,Gadal/sympy,Arafatk/sympy,wyom/sympy,drufat/sympy,iamutkarshtiwari/sympy,abhiii5459/sympy,vipulroxx/sympy,aktech/sympy,Arafatk/sympy,pandeyadarsh/sympy,sahmed95/sympy,AunShiLord/sympy,atsao72/sympy,sahilshekhawat/sympy,grevutiu-gabriel/sympy,debugger22/sympy,MechCoder/sympy,ahhda/sympy,cswiercz/sympy,liangjiaxing/sympy,shipci/sympy,amitjamadagni/sympy,liangjiaxing/sympy,atsao72/sympy,Vishluck/sympy,abloomston/sympy,maniteja123/sympy,garvitr/sympy,kumarkrishna/sympy,AkademieOlympia/sympy,jaimahajan1997/sympy,maniteja123/sympy,amitjamadagni/sympy,wanglongqi/sympy,dqnykamp/sympy,beni55/sympy,iamutkarshtiwari/sympy,Vishluck/sympy,MridulS/sympy,Shaswat27/sympy,diofant/diofant,jamesblunt/sympy,drufat/sympy,abloomston/sympy,oliverlee/sympy,hrashk/sympy,lindsayad/sympy,meghana1995/sympy,sunny94/temp,grevutiu-gabriel/sympy,jaimahajan1997/sympy,beni55/sympy,debugger22/sympy,Curious72/sympy,VaibhavAgarwalVA/sympy,Sumith1896/sympy,Titan-C/sympy,Gadal/sympy,abloomston/sympy,pbrady/sympy,ga7g08/sympy,kaichogami/sympy,skidzo/sympy,kumarkrishna/sympy,asm666/sympy,jbbskinny/sympy,jamesblunt/sympy,VaibhavAgarwalVA/sympy,chaffra/sympy,lindsayad/sympy,Designist/sympy,Davidjohnwilson/sympy,mafiya69/sympy,kaichogami/sympy,shikil/sympy,jbbskinny/sympy,liangjiaxing/sympy,mcdaniel67/sympy,kmacinnis/sympy,rahuldan/sympy,hargup/sympy,kaichogami/sympy,farhaanbukhsh/sympy,kevalds51/sympy,sampadsaha5/sympy,Curious72/sympy,ahhda/sympy,postvakje/sympy,bukzor/sympy,cswiercz/sympy,ChristinaZografou/sympy,vipulroxx/sympy,atreyv/sympy,MechCoder/sympy,toolforger/sympy,skidzo/sympy,garvitr/sympy,chaffra/sympy,atsao72/sympy,sahilshekhawat/sympy,skidzo/sympy,drufat/sympy,emon10005/sympy,Arafatk/sympy,souravsingh/sympy,hargup/sympy,madan96/sympy,cccfran/sympy,sahmed95/sympy,pbrady/sympy,shipci/sympy,grevutiu-gabriel/sympy,Titan-C/sympy,vipulroxx/sympy,hargup/sympy,rahuldan/sympy,debugger22/sympy,AkademieOlympia/sympy,atreyv/sympy,mcdaniel67/sympy,garvitr/sympy,Titan-C/sympy,Mitchkoens/sympy,jerli/sympy,abhiii5459/sympy,lidavidm/sympy,wyom/sympy,bukzor/sympy,srjoglekar246/sympy,ga7g08/sympy,sahilshekhawat/sympy,kumarkrishna/sympy,dqnykamp/sympy,Sumith1896/sympy,kevalds51/sympy,Sumith1896/sympy,MechCoder/sympy,pandeyadarsh/sympy,aktech/sympy,souravsingh/sympy,moble/sympy,maniteja123/sympy,oliverlee/sympy,yukoba/sympy,meghana1995/sympy,Shaswat27/sympy,moble/sympy,jamesblunt/sympy,mafiya69/sympy,mafiya69/sympy,aktech/sympy,sahmed95/sympy,lindsayad/sympy,AunShiLord/sympy,kaushik94/sympy,pbrady/sympy,skirpichev/omg,postvakje/sympy,VaibhavAgarwalVA/sympy,toolforger/sympy,kaushik94/sympy,sampadsaha5/sympy,lidavidm/sympy,yashsharan/sympy,AkademieOlympia/sympy,AunShiLord/sympy,Designist/sympy,Shaswat27/sympy,Davidjohnwilson/sympy,Mitchkoens/sympy,Designist/sympy,kmacinnis/sympy,saurabhjn76/sympy,Davidjohnwilson/sympy,iamutkarshtiwari/sympy,asm666/sympy,kevalds51/sympy,lidavidm/sympy,postvakje/sympy,shipci/sympy,abhiii5459/sympy,ahhda/sympy,jerli/sympy,atreyv/sympy,cccfran/sympy,saurabhjn76/sympy,hrashk/sympy,jaimahajan1997/sympy,rahuldan/sympy,wanglongqi/sympy,sampadsaha5/sympy,Gadal/sympy,madan96/sympy,kmacinnis/sympy,sunny94/temp,oliverlee/sympy,jbbskinny/sympy,pandeyadarsh/sympy,yukoba/sympy,Vishluck/sympy,madan96/sympy,emon10005/sympy,beni55/sympy,sunny94/temp,bukzor/sympy,yashsharan/sympy,Mitchkoens/sympy,asm666/sympy,shikil/sympy,toolforger/sympy,Curious72/sympy,jerli/sympy,MridulS/sympy,hrashk/sympy,shikil/sympy,cswiercz/sympy,farhaanbukhsh/sympy,moble/sympy,farhaanbukhsh/sympy