Paste in 64bit PowerShell Terminal duplicates text pasted.

[gerane]

• VSCode Version: 1.3.0-insider
• OS Version: Windows 10

Steps to Reproduce:

1. Copy text
2. Paste into 64bit powershell terminal.
3. Text that is pasted is duplicated 1-2 times.

This is what is copied for example.

// Place your settings in this file to overwrite default and user settings.
{
   "terminal.integrated.shell.windows": "C:\\WINDOWS\\sysnative\\WindowsPowerShell\\v1.0\\powershell.exe"
}

// Place your settings in this file to overwrite default and user settings.
{
   "terminal.integrated.shell.windows": "C:\\WINDOWS\\sysnative\\WindowsPowerShell\\v1.0\\powershell.exe"
}// Place your settings in this file to overwrite default and user settings.
{
   "terminal.integrated.shell.windows": "C:\\WINDOWS\\sysnative\\WindowsPowerShell\\v1.0\\powershell.exe"
}// Place your settings in this file to overwrite default and user settings.
{
   "terminal.integrated.shell.windows": "C:\\WINDOWS\\sysnative\\WindowsPowerShell\\v1.0\\powershell.exe"
}

and the above might be the results. Tested on multiple computers with the latest build

[Tyriar]

This seems to be working fine using the new xterm-level copy and paste. The keybinding is currently ctrl+ins for copy and shift+ins to paste but I plan on making this configurable in #6451 and xtermjs/xterm.js#118