Describe the bug

When using nu compiled with starship prompt support, the prompt appears mangled. See screenshot.

%{%}~%{%} 
%{%}->%{%} cd aur-build/nushell/

%{%}nushell%{%} on %{%} %{%}%{%}master%{%} is %{%}📦 %{%}%{%}v0.5.1%{%} via %{%}🦀 %{%}%{%}v1.39.0%{%} 
%{%}->%{%}

The syntax highlighting appears to work though.

To Reproduce

Steps to reproduce the behavior:

1. cargo install --path . --features starship-prompt --force
2. nu

The problem appears with both alacritty and kitty. It occurs when nu is started from zsh or bash.

Expected behavior

The prompt should appear as normal.

Screenshots

Configuration

• OS: Arch Linux
• Version Kernel 5.3.12
• Rust:

# cargo --version && rustc --version
cargo 1.39.0 (1c6ec66d5 2019-09-30)
rustc 1.39.0 (4560ea788 2019-11-04)

• Terminal: Kitty v0.14.6 or Alacritty fork v0.3.3
• Optional features: starship-prompt