Undefined behaviour when prompt has newline

[str1ngs-bytes]

`
// This Code Work's Fine
var App = grumble.New(&grumble.Config{
Name: "Cli",
Prompt: "Main Menu : ",
})

terminal output :
Main Menu :

// This Code Does Not Work
var App = grumble.New(&grumble.Config{
Name: "Cli",
Prompt: "User james Kelly \n >> : ",
})

terminal output :
User james Kelly

//But when pressed 'enter' or typing this happens :
// When Pressed Enter :
User james Kelly
User james Kelly
User james Kelly
">>"
User james Kelly
">>"

// While Typing :
User james Kelly
User james Kelly
User james Kelly
User james Kelly
User james Kelly
">> abcd"

// Expected Same As Single Line Prompt
// When Pressed Enter :
User james Kelly
">>"
User james Kelly
">>"

// While Typing :
User james Kelly
">> abcd"

Note : While typing it prints promt every single key press.
Is there a quick fix to this? I need to deliver to the client asap.
`

[skaldesh]

Maybe the readline lib is not able to handle newlines. @r0l1 wyt?