neovim-qt does not show vim-airline fonts properly when connected to a remote nvim

[f-squirrel]

I have Ubuntu 18.04 where I run nvim as a server: nvim --listen <ip>:<port> --headless.
And MacOS Catalina where I run neovim-qt as a client: nvim-qt --server <IP>:<port>.

The top and bottom lines are presented incorrectly:

However, when I run neovim-qt locally they are fine.
Ubuntu:

MacOS:

Both machines have the same .vimrc and ginit.vim:

"I want to see buffers on top of the screen
GuiTabline 0

"This is a good feature but unfortunately it is not good for the YCM
"Need to check from time to time if it works
GuiPopupmenu 0

Guifont Source Code Pro for Powerline:h16
colorscheme monokai

"Allows yanking to the local clipboard(even from remote!)
call GuiClipboard()

I went through help: nvim-gui-shim but did not find a command fixing the problem.

Could you please advise?

[jgehrig]

What is the output of :GuiFont?

It probably displays something other than Source Code Pro for Powerline:h16.

You need to escape the spaces, same as guifont:

Guifont Source\ Code\ Pro\ for\ Powerline:h16

[jgehrig]

Would you like to expand the documentation to include a note about this and an example?

I have seen this before and I think it would be useful to other users :)

https://github.com/equalsraf/neovim-qt/blob/9c21aef8dbe66298fc833c9615f9e844ffb3090e/src/gui/runtime/doc/nvim_gui_shim.txt#L20-L48

[f-squirrel]

@jgehrig ,
Actually, :GuiFont returns the font defined in ginit.vim so I am not sure if it is reasonable to update the documentation.
Nevertheless, I've added the escape symbols but it did not help.

[jgehrig]

Sorry, I think I was confused as to what the issue was... What exactly is the problem?

Is this an issue with the coloring of the arrow-like vim-airline characters?

Notice the highlighted characters are white, not yellow:

[f-squirrel]

@jgehrig , the problem is that the highlighted characters are rendered differently when neovim-qt running at MacOS is connected to nvim running at Ubuntu and when neovim-qt is connected to a local nvim(for both MacOS and Ubuntu).

[akiyosi]

Perhaps it's because the termguicolors configuration for the remote nvim isn't working.
I had a similar problem with goneovim because I didn't set termguicolors at startup (See https://github.com/akiyosi/goneovim/issues/79#issuecomment-611001053).

[f-squirrel]

@akiyosi , adding set termguicolors to init.vim did solve the problem!
Thank you very much!