Selecting a whole line using API includes trailing \r\n.

Details

• Browser and browser version: Chrome 95
• OS version: Windows 10
• xterm.js version: 4.14.0

Steps to reproduce

1. terminal.resize(30,20)
2. terminal.write("012345678901234567890123456789")
3. Select the line using the mouse.
4. Confirm that terminal.getSelectionPosition() is {startColumn: 0, startRow: 0, endColumn: 31, endRow: 0}
5. terminal.select(0,0,31)
6. terminal.getSelectionPosition() is {startColumn: 0, startRow: 0, endColumn: 1, endRow: 1} and getSelection() returns '012345678901234567890123456789\r\n'

See below.