Fix Selection::insert when replacing with empty string at the end of the buffer
Fix Selection::insert when replacing with empty string at the end of the buffer

alexherbo2/kakoune,alpha123/kakoune,Somasis/kakoune,rstacruz/kakoune,elegios/kakoune,jkonecny12/kakoune,zakgreant/kakoune,lenormf/kakoune,ekie/kakoune,danr/kakoune,danr/kakoune,Somasis/kakoune,danielma/kakoune,zakgreant/kakoune,ekie/kakoune,jjthrash/kakoune,alexherbo2/kakoune,lenormf/kakoune,flavius/kakoune,danielma/kakoune,flavius/kakoune,Somasis/kakoune,xificurC/kakoune,jkonecny12/kakoune,casimir/kakoune,flavius/kakoune,zakgreant/kakoune,rstacruz/kakoune,lenormf/kakoune,occivink/kakoune,Asenar/kakoune,alpha123/kakoune,alpha123/kakoune,mawww/kakoune,Asenar/kakoune,Asenar/kakoune,elegios/kakoune,xificurC/kakoune,zakgreant/kakoune,flavius/kakoune,mawww/kakoune,jkonecny12/kakoune,ekie/kakoune,alpha123/kakoune,Asenar/kakoune,ekie/kakoune,rstacruz/kakoune,jjthrash/kakoune,occivink/kakoune,occivink/kakoune,elegios/kakoune,casimir/kakoune,xificurC/kakoune,Somasis/kakoune,jjthrash/kakoune,lenormf/kakoune,mawww/kakoune,jkonecny12/kakoune,casimir/kakoune,occivink/kakoune,danr/kakoune,danielma/kakoune,alexherbo2/kakoune,alexherbo2/kakoune,mawww/kakoune,rstacruz/kakoune,danr/kakoune,danielma/kakoune,elegios/kakoune,casimir/kakoune,xificurC/kakoune,jjthrash/kakoune