
                    For terminal-themes, we pick up the best solutions provided by github life savers.
                    If google brings you here, you are so lucky! These life savers are angels, they have well solved your problems.
                    So do not waste time scrolling the original issue threads just to dig out solutions... 
                    Here you are, you are welcome. Then, go back to work!
                    

Update
At first it seemed like if I found a PowerLine font that was also enabled with nerd-fonts I could get things to work in vscode 

powerlevel9k VSCode integrated terminal versus nerdfont-complete

@bhilburn @jordanweaver I've got an update I've managed to get the issue to stop 

powerlevel9k Prompt with newline causes previous lines to be deleted when tab autocompleting

So POWERLEVEL9K_MODE='awesome-patched' stands before you source oh-my-zsh right?
If so have you restarted zsh? 

powerlevel9k os_icon shows os as text

I have encountered the same problem on iTerm and I've solved it The reason for the problem is ROOT_ICON the emoji widths problem To solve it 

powerlevel9k Character duplicate when using tab completion as root

By the way for those of you who don't follow /r/zsh Powerlevel10k now works on all major platforms (Mac Linux FreeBSD and WSL) 