Provide Rio's own powerline symbols about rio HOT 1 OPEN

Hey there @mhartington thanks for the issue, sorry about delay to reply.

This is to be expected, though, since the line height doesn't actually modify the font. In iterm, they provide an option to deal with this, where powerline glyphs can be swapped for internal one. These internal powerline glyphs will match the line height and look correct, regardless of what the user sets.

Yes I was going to say this. Thanks for sharing about the iTerm2 solution, I didn't know that. Currently I am working in a major rewrite of the renderer to support a decent line-height calculation (#428) but probably it will not fix this issue either. Then I wonder what might be the best fix for this case, thinking in allow scale certain glyphs via configuration (in this case the powerline icons) to match the line or a specific size.

from rio.