DiagramGrid: Add examples for width, height, and __getitem__.
DiagramGrid: Add examples for width, height, and __getitem__.

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