Also fix VimRenderer.strwidth
Also fix VimRenderer.strwidth

Fixes #356
junix/powerline,bartvm/powerline,firebitsbr/powerline,junix/powerline,xfumihiro/powerline,S0lll0s/powerline,magus424/powerline,blindFS/powerline,Liangjianghao/powerline,xxxhycl2010/powerline,magus424/powerline,darac/powerline,s0undt3ch/powerline,bezhermoso/powerline,S0lll0s/powerline,Liangjianghao/powerline,magus424/powerline,S0lll0s/powerline,seanfisk/powerline,russellb/powerline,firebitsbr/powerline,Luffin/powerline,dragon788/powerline,lukw00/powerline,Luffin/powerline,seanfisk/powerline,DoctorJellyface/powerline,QuLogic/powerline,areteix/powerline,junix/powerline,cyrixhero/powerline,blindFS/powerline,keelerm84/powerline,prvnkumar/powerline,russellb/powerline,kenrachynski/powerline,kenrachynski/powerline,xxxhycl2010/powerline,EricSB/powerline,s0undt3ch/powerline,wfscheper/powerline,blindFS/powerline,areteix/powerline,DoctorJellyface/powerline,wfscheper/powerline,wfscheper/powerline,xfumihiro/powerline,areteix/powerline,bartvm/powerline,QuLogic/powerline,kenrachynski/powerline,Luffin/powerline,keelerm84/powerline,prvnkumar/powerline,darac/powerline,xxxhycl2010/powerline,EricSB/powerline,lukw00/powerline,seanfisk/powerline,dragon788/powerline,IvanAli/powerline,bezhermoso/powerline,lukw00/powerline,DoctorJellyface/powerline,cyrixhero/powerline,firebitsbr/powerline,bezhermoso/powerline,darac/powerline,s0undt3ch/powerline,russellb/powerline,QuLogic/powerline,IvanAli/powerline,bartvm/powerline,dragon788/powerline,EricSB/powerline,Liangjianghao/powerline,IvanAli/powerline,xfumihiro/powerline,cyrixhero/powerline,prvnkumar/powerline