Clearing Terminal only clears visible area

[CoenraadS]

• VSCode Version: 1.9
• OS Version: Windows 10 Build 14986

Default terminal is powershell

Steps to Reproduce:

1. In VSCode generate enough output to cause terminal to scroll
2. Type cls

Expected:

Entire terminal should be cleared, including content outside of viewport (if scroll up). This is how it works in a powershell console.

Actual:

Only the visible area is cleared. By scrolling up old content is visible.

My use-case:

I like to cls and then run npm test. Then the beginning of my terminal is where my test output starts.

Now I cls, but I have no idea where the beginning of my test output is.

[CoenraadS]

Just realized this is a dupe: xtermjs/xterm.js#106