Previous terminal line is removed when answer is string longer than 80 chars

[dmartin35]

When prompting for a answer, if the response contains 80+ characters, the previous line in the terminal disappear / is removed

What operating system and terminal are you using?
seen on mac os x with default terminal and vscode terminal

An example that showcases the bug.

package main

import (
	"fmt"

	"github.com/AlecAivazis/survey/v2"
)

func main() {
	fmt.Println("This message should not be removed even if anwser has length >= 80 chars")

	var (
		r1 string
	)

	_ = survey.AskOne(&survey.Input{
		Message: "Enter a very long response",
	}, &r1)

	fmt.Println("response: ", r1)

}

What did you expect to see?

$ go run question.go 
This message should not be removed even if anwser has length >= 80 chars
? Enter a very long response 01234567890123456789012345678901234567890123456789012345678901234567890123456789
response:  01234567890123456789012345678901234567890123456789012345678901234567890123456789

What did you see instead?

$ go run question.go 
? Enter a very long response 01234567890123456789012345678901234567890123456789012345678901234567890123456789
response:  01234567890123456789012345678901234567890123456789012345678901234567890123456789

[dmartin35]

I have added a runtime stack trace , when the

survey/terminal/cursor.go

Line 49 in c79c4a9

func (c *Cursor) PreviousLine(n int) {

function is called

runtime/debug.Stack(0x24, 0x0, 0x0)
        /usr/local/Cellar/go/1.15.3/libexec/src/runtime/debug/stack.go:24 +0x9f
runtime/debug.PrintStack()
        /usr/local/Cellar/go/1.15.3/libexec/src/runtime/debug/stack.go:16 +0x25
github.com/AlecAivazis/survey/v2/terminal.(*Cursor).PreviousLine(0xc0001e57e0, 0x1)
        /Users/dmartin/go/src/github.com/AlecAivazis/survey/terminal/cursor.go:58 +0x157
github.com/AlecAivazis/survey/v2.(*Renderer).resetPrompt(0xc0001d4000, 0x1)
        /Users/dmartin/go/src/github.com/AlecAivazis/survey/renderer.go:115 +0x205
github.com/AlecAivazis/survey/v2.(*Renderer).Render(0xc0001d4000, 0x118978c, 0x493, 0x1171f00, 0xc0001b1040, 0x0, 0x0)
        /Users/dmartin/go/src/github.com/AlecAivazis/survey/renderer.go:75 +0xa8
github.com/AlecAivazis/survey/v2.(*Input).OnChange(0xc0001d4000, 0xc000000073, 0xc0001d6048, 0x0, 0x0, 0x0)
        /Users/dmartin/go/src/github.com/AlecAivazis/survey/input.go:119 +0x235
github.com/AlecAivazis/survey/v2.(*Input).Prompt(0xc0001d4000, 0xc0001d6048, 0x0, 0x0, 0x0, 0x0)
        /Users/dmartin/go/src/github.com/AlecAivazis/survey/input.go:169 +0x2fa
github.com/AlecAivazis/survey/v2.Ask(0xc0001e5eb0, 0x1, 0x1, 0x114faa0, 0xc000188430, 0x0, 0x0, 0x0, 0x0, 0x118a290)
        /Users/dmartin/go/src/github.com/AlecAivazis/survey/survey.go:295 +0x55e
github.com/AlecAivazis/survey/v2.AskOne(0x11b3120, 0xc0001d4000, 0x114faa0, 0xc000188430, 0x0, 0x0, 0x0, 0x1005dc5, 0xc00006c058)
        /Users/dmartin/go/src/github.com/AlecAivazis/survey/survey.go:238 +0x12d
main.main()

don't know if that could help for investigation