Weird colouring in Windows Powershell

[sunesimonsen]

Problem: https://files.gitter.im/unexpectedjs/unexpected/boB2/MinimalReactTest1.PNG

Repro: https://github.com/gertsonderby/magicpen-test

[gertsonderby]

Notably, this bug seems to only occur in Powershell (specifically, the 'GitHub for Windows' Git Shell). Not sure what it would take to replicate elsewhere.

[gertsonderby]

Confirmed as happening (with slightly different colors) in default Powershell (w/o GitHub extensions).

Commenting out node_modules/magicpen/lib/AnsiSerializer.js:131appears to solve the problem.

[sunesimonsen]

We only close the colors once even when we start a standard color wrapped in a 256 color. It would be interesting to try to insert the following on the line after AnsiSerializer.js:131:

close += ansiStyles[styleName].close;

[gertsonderby]

That had no effect that I could discern. Still a discolored background.