Description

When running ping /t inside a psmux pane on Windows, the process cannot be stopped with Ctrl+C. The keypress is either ignored or intercepted by psmux, and the ping command continues indefinitely.

Environment

• OS: Windows 10
• Shell: PowerShell
• psmux version: 3.3.5

Steps to Reproduce

1. Start psmux and open multiple panes.
2. In one pane, run:

   ping /t 8.8.8.8
   

3. Try to stop the command with Ctrl+C.

Actual Result

• The ping process keeps running.
• Ctrl+C does not terminate it.
• Tried Ctrl+Break and tmux-style Ctrl+b → Ctrl+C, but none worked.

Expected Result

• Pressing Ctrl+C inside the pane should send an interrupt signal to the process and stop ping /t.

Additional Notes

• In a normal terminal (outside psmux), Ctrl+C works as expected.
• This suggests psmux is not correctly forwarding interrupt signals to Windows processes.