Tmux status line last character appears on on next line

[Thermatix]

Currently running MacOS High Sierra, version 10.13.3.

I'm using alacritty built from source into an .app .

Now normally this would be an issue for Tmux itself however this Issue only appears on Alacritty, I've added the character | to the end of my Tmux status line so It doesn't bother me too much.
Without | the last character printed gets moved to the beginning of the last line, so you might see a number if you're using a date for example, and no, adding whitespace doesn't stop the last character from getting moved.

Here's a screenshot example (look at the first character next to the buffer tab):

P.s. I'd like to add, Alacritty is Sooooo much faster then Iterm2 and it's fixed a super aggravating, annoying problem where the powerline characters didn't line up properly, so just for this THANK YOU!

[jwilm]

This is an issue with how unicode widths are calculated. Closing in favor of #1295.