Fix "➜" and "✗" of oh-my-zsh default theme making the cursor position wrong under some terminals(such as Mosh Chrome App, Termius[Chrome App Version, Mac Version, Windows Version])

changeUnicodeToAsciiOfOhMyZshDefaultTheme.sh

#!/bin/sh 

DIR="$HOME/.oh-my-zsh/custom/themes"
mkdir -p $DIR
cd $DIR

sed "s/➜/→/g;s/✗/×/g" $HOME/.oh-my-zsh/themes/robbyrussell.zsh-theme > robbyrussell.zsh-theme

I was using honukai.zsh-theme, and it uses the ✖︎ symbol. So for my case I updated the replacement command:

sed "s/➜/→/g;s/✗/×/g;s/✖︎/×/g"

I also had a lot of trouble to set up Powerline on iTerm2 and also oh-my-zsh and just recently bought a Chromebook and I had the same issue like you.

Found a solution:
Use the right fonts -> https://github.com/wernight/powerline-web-fonts

No Problem with hterm or iTerm or any other terminal emulator.
Use one of those fonts with zsh and you will be happy :o)

Cheers guys

@everdimension
@cellcoresystems

Actually the rendering issue under Termius has been fixed for months.
Just check the 'Use new terminal rendering engine' box on under Preferences of Termius.

And because I had stopped using my chromebook, this script is useless for me for now.

(Rendering issue has never been reproduced under iTerm or Terminal of macOS, or default terminal under Ubuntu, or any other modern terminal emulator. )