Neovim CPU usage about vim-matchup

[amerov]

I catched that it caused by enabling matchup_matchparen_deferred

[andymass]

I take this issue very seriously. Can you please verify it happens with the minimal example init.vim:

set nocompatible

" change this path to where the plugin is located
let s:matchup = '~/.config/nvim/bundle/vim-matchup'

let &rtp  = s:matchup . ',' . &rtp
let &rtp .= ',' . s:matchup . '/after'

filetype plugin indent on
syntax on 

" relevant options here
let g:matchup_matchparen_deferred = 1

[amerov]

with above config it is ok.
it happens with airline.

[andymass]

I think I can reproduce this:

  with airline only: 0% CPU
  with match-up only: 0% CPU
  with airline and match-up: 3--4% CPU

It makes no sense. When the cursor is not moving, the deferred timer is in a paused state and should consume no CPU. I verified the callback is not being triggered when the cursor is not moving. I don't see why it relates to airline.

This might be a neovim bug, and it might be related to this neovim/neovim#7871

[andymass]

cf. neovim/neovim#8188

[andymass]

Fixed in neovim 0.3.0, recently released.