White line / top border after Mojave upgrade?

• 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: MacOS Mojave 10.14
• Hyper.app version: Hyper 2.1.0-canary.2
• Link of a Gist with the contents of your .hyper.js: https://gist.github.com/JesseLeite/2d8c5cedcd161a2eafff6647959c29de
• Relevant information from devtools (CMD+ALT+I on macOS, CTRL+SHIFT+I elsewhere):
• The issue is reproducible in vanilla Hyper.app:

Issue

After upgrading to Mojave, I notice electron apps have a harsh white border at the top, which is especially noticeable on dark backgrounds. It happens in both dark and light mode. In this case, I have border: 0 !important; styling on my hyper window, so that you can see how apparent it is without the default hyper border...

I've also heard people say that all (even non-electron) windows have it, but native windows look way more natural than electron windows...

I realize this might be actually on electron to fix (see https://github.com/electron/electron/issues/13164), but in that thread apparently the VS Code Insiders build has a 'fix', so I thought I'd share here in case it might be something that could be remedied on Hyper's end?

Reproduce the white top border in Hyper 2.1.0-canary.2 on macOS Mojave, first checking the linked .hyper.js configuration and then testing vanilla Hyper through the devtools entry point. Compare the result with Electron issue #13164 and determine whether Hyper has a remedy; done means the unwanted border is absent without breaking the window styling.