Hyper adds extra spaces on copy/paste in vim

• 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 10.14.5
• Hyper.app version: 3.0.2
• Link of a Gist with the contents of your .hyper.js: https://gist.github.com/CyrilMazur/b761689171754238adab4dd1e03add82
• Relevant information from devtools (CMD+ALT+I on macOS, CTRL+SHIFT+I elsewhere):
• The issue is reproducible in vanilla Hyper.app:

Issue

I use vim a lot. When I select a line (see screenshot), press cmd+c and then cmd+v it copy/pastes only the text that's on the line (in the screenshot "foo"), but after a few hours or days of usage, cmd+c will copy "foo" + as many extra spaces as there are until the end of the line on the screen. I don't know how to trigger this intentionally, it just happens after sometime. Quitting and re-opening Hyper fixes the issue.

Start by reproducing the copy/paste behavior in Hyper 3.0.2 on macOS with vim, using the reported cmd+c and cmd+v sequence and checking whether restarting Hyper clears it. Trace the selection and clipboard behavior around the point where extra spaces are copied; done means copying a selected line consistently copies only its text.