Tabpage indicator doesn't update on :tabmove

[mawkler]

Description

When moving the current tabpage with :tabmove the tabpage indicator does not update.

To Reproduce

init.vim:

call plug#begin('~/.vim/bundle')
Plug 'romgrk/barbar.nvim'
call plug#end()

Steps to reproduce the behavior:

1. Run Neovim
2. :tabedit (create new tabpage, indicator shows 2/2)
3. :tabmove 0 (make this tabpage the first one)
4. Tabpage indicator still shows 2/2 since it hasn't been updated.
5. To confirm that :tabmove 0 actually moved the tab page do gtgT. Now the tabpage indicator shows 1/2 as expected.

[Iron-E]

There's a missing bufferline#update() in plugin/bufferline.vim. Unfortunately there's no event for tabs being moved— I did find neovim/neovim#6916 though.

I never saw this before because I use nvim-tabmode to manage my tabs, rather than manual commands.

nvim-tabmode is based on nvim-libmodal, which performs a :redraw on mode exit. As such, whenever I moved a tab, the screen was redrawn. Your screen won't redraw until we tell it to, since you aren't using that.