Add support for calculation of cumulative positioned offsets and use it to correctly determine visibility and event positions within canvases nested in relative divs.
Add support for calculation of cumulative positioned offsets and use it to correctly determine visibility and event positions within canvases nested in relative divs.

JunaidPaul/paper.js,li0t/paper.js,proofme/paper.js,luisbrito/paper.js,iconexperience/paper.js,proofme/paper.js,byte-foundry/paper.js,nancymark/paper.js,rgordeev/paper.js,iconexperience/paper.js,Olegas/paper.js,li0t/paper.js,lehni/paper.js,legendvijay/paper.js,superjudge/paper.js,iconexperience/paper.js,lehni/paper.js,fredoche/paper.js,nancymark/paper.js,superjudge/paper.js,fredoche/paper.js,EskenderDev/paper.js,Olegas/paper.js,legendvijay/paper.js,JunaidPaul/paper.js,byte-foundry/paper.js,li0t/paper.js,mcanthony/paper.js,JunaidPaul/paper.js,mcanthony/paper.js,byte-foundry/paper.js,luisbrito/paper.js,legendvijay/paper.js,EskenderDev/paper.js,mcanthony/paper.js,EskenderDev/paper.js,baiyanghese/paper.js,rgordeev/paper.js,fredoche/paper.js,rgordeev/paper.js,Olegas/paper.js,baiyanghese/paper.js,superjudge/paper.js,baiyanghese/paper.js,proofme/paper.js,luisbrito/paper.js,lehni/paper.js,ClaireRutkoske/paper.js,nancymark/paper.js,ClaireRutkoske/paper.js,ClaireRutkoske/paper.js,chad-autry/paper.js