bling/vim-airline — pull request #174 by jacobwalker0814 (2013-08-22 14:19:27+00:00)
Title: Better toggling of powerline fonts

If using a vim distribution that sets `let g:airline_powerline_fonts=1` then in your own config you disable it with `let g:airline_powerline_fonts=0` then airline will still show the powerline symbols because the variable exists. Check the value of airline_powerline_fonts not just existence.