Customizations added via airline#add_statusline_func() are not respected in terminal windows

[nikvdp]

environment

• vim: NVIM v0.4.3
• vim-airline: commit aa773f5cdfeba1ecb8ae5b55d9ab5fc817f0951d
• OS: mac
• Have you reproduced with a minimal vimrc: yes
• What is your airline configuration: default
  if you are using terminal:
• terminal: kitty
• $TERM variable: xterm-256color
• color configuration (:set t_Co?):
  if you are using Neovim:
• does it happen in Vim: yes

actual behavior

After using call airline#add_statusline_func() customizations appear on the new terminal window, but disappear if you <C-w> out of the window.

As a workaround I am disabling airline's own term extension (via g:airline#extension#term#enabled = 0) in my vimrc. It works as expected with airline's term extension disabled.

Here is the statusline func I was using to test. You can drop it in init.vim to reproduce.

function! MyPluginThing(...)
  return "!!! I AM CUSTOM !!!"
endfunction

function! MyPlugin(...)
    let w:airline_section_a = 'MyPlugin3'
    let w:airline_section_b = '%f'
    let w:airline_section_c = '%{MyPluginThing()}'
    let g:airline_variable_referenced_in_statusline = 'foo'
endfunction
call airline#add_statusline_func('MyPlugin')

expected behavior

Terminal windows honor the airline#add_statusline_func() at all times.

screen shot (if possible)

Note that the !!! I AM CUSTOM !!! string is originally present in the terminal window, but after I move in and out of the window it disappears.

[chrisbra]

I think you need to use airline#add_inactive_statusline_func to have it apply for in-active statuslines as well.

[nikvdp]

I’ll give that a try, but I believe this is still a bug since it stays gone even when you switch back to the original window

[bzub]

I see this also with default statusline functions. Section B for example shows git information in Terminal mode but then loses that information switching between windows.