On some files, a line (often the status line) overflows straight onto the next line, which screws up rendering until the size changes (when I close/resize a vertical split etc). This also happens regardless of whether I'm in tmux or not, to clarify. I'm using NeoVim, but I can reproduce the same behaviour in regular Vim too.

It's worse when I have airline enabled, but it still happens sometimes if I have it disabled.

The appropriate settings in my vimrc.

" tmux background fix
set t_Co=256

" show airline
set laststatus=2

" fix airline symbols
let g:airline_powerline_fonts = 1
let g:airline_theme = 'gotham'

if !exists('g:airline_symbols')
  let g:airline_symbols = {}
  let g:airline_symbols.space = "\ua0"

I'm using urvxt, but I get the same results with gnome terminal, too. Here's the only configuration I've got for that.

URxvt.scrollBar: false
URxvt.font: xft:Inconsolata for Powerline:size=13:style=Medium
URxvt.boldFont: xft:Inconsolata for Powerline:size=13
URxvt.title: Terminal

The rest of my dotfiles are on Github.

Any idea what could be causing this behaviour? It's especially bad when I do a vertical split and the panes have content that overflows. Scrolling one of them causes the other to get stuck.

I suspect it might be something to do with the font. If I use Inconsolata for Powerline-g then it doesn't always overflow, but the colors are wrong.

In addition to this, none of the following CSS coloring plugins work: ap/vim-css-color, skammer/vim-css-color and gorodinskiy/vim-coloresque. Colors just show up as regular syntax highlighted text.

Sometimes it overflows anyway. Here you can see the written to file message rendered over the right side of airline.

This is a known bug in neovim and vim. The problem however appears to be a lot smaller on vim, since I saw that only sometimes, while in neovim it seems to happen a lot more often with statusline highlighting plugins (e.g. airline). BTW: for airline, there is a workaround documented

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