Without `set guifont = Monospace\ 11`, the script fails

[DaYangtuo247]

I think I found a bug. This script doesn't work when I don't have the line set guifont = Monospace\ 11 in my .vimrc file.

[eggbean]

Yes, there is a bug which I have meant to fix for ages. I've been meaning to look into it, so I should.

With the font that I use, only the key to reduce font size works, with increase and reset not working.