White text backgrounds added on Windows 10 / WSL / zsh

• I am on the latest Hyper.app version

• I have searched the issues of this repo and believe that this is not a duplicate

• OS version and name: Windows 10 v1809, build 17763.316

• Hyper.app version: 2.1.2

• Link of a Gist with the contents of your .hyper.js: https://gist.github.com/Rainbowlemon/c66a2c2e10506fa81cdfb1fe3cdca6a4

• Relevant information from devtools (CMD+ALT+I on macOS, CTRL+SHIFT+I elsewhere): Not sure if it's relevant, but this is shown in the console:

Color: rgba(255, 255, 255, 0.2) is using transparency, but allowTransparency is false. Using fallback #555753.

• The issue is reproducible in vanilla Hyper.app: Yes, as far as I can tell.

Issue

I recently updated my windows version, and it has seemed to break text output on Hyper. I'm using WSL, so my shell is ubuntu1804.exe, and I'm loading zsh. Output works fine on mintty, powershell, or the ubuntu shell - I only get this issue on Hyper.

Start by reproducing the white text backgrounds with Hyper.app 2.1.2 on Windows 10 using WSL's ubuntu1804.exe and zsh. Check the devtools warning about transparency and compare the behavior with mintty, PowerShell, and the Ubuntu shell. Done means terminal output renders without the added white backgrounds in vanilla Hyper.app.