MOSH's escape keyboard shortcut (ctrl+^) not worked

[amurchick]

• 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 10.15.3

• Hyper.app version: 3.0.2 (stable)

• The issue is reproducible in vanilla Hyper.app: Is Vanilla

Issue

In MOSH (https://mosh.mit.edu/) for exit I am need to input ctrl+^ (actually for this I am pressed keys ctrl, shift, 6).

From MOSH manual:

ESCAPE SEQUENCES
       The  default  escape  character used by Mosh is ASCII RS (decimal 30).  
       This is typically typed as Ctrl-^ or Ctrl-Shift-6, on US English keyboards.  

In Chrome this combination catched by event keypress like this (key code === 30):

In Hyper this combination not worked.
In iTerm and native terminal app - this combination worked.

How to reproduce:

1. In Hyper connect to linux which have command showkey (I am use debian) and run

showkey -a

and then press ctrl, shift, 6 - nothing was happends.
2. In other terminal do same - and you will see:

Thank you for you work!

[ssthomas]

I am also having this issue in Windows.

[amurchick]

I am start using https://github.com/xtermjs/xterm.js by my work and xterm.js have same issue.
So it may be not hyper issue.

I am create xtermjs/xterm.js#2797 in xterm.js repo.