Bug: Strange error when scrolling through a line containing substring `['%']`?

[NWang]

Moving from upstream issue: nvim-lualine/lualine.nvim#873

Self Checks

• I'm using the latest lualine.
• I didn't find the issue in exsisting issues or prs.

How to reproduce the problem

1. You will need to create a lua file, with lua LSP Client sumneko/lua-language-server attached.
2. The lua file should contain a lua table like this:

   window = {
     mappings = {
       -- root behaviour.
       ['-'] = 'navigate_up',
       ['<C-]>'] = 'set_root',
   
       -- tree itself.
       ['R'] = 'refresh',
   
       -- open files.
       ['<2-LeftMouse>'] = 'shift_M_open',
       ['<cr>'] = 'shift_M_open',
       ['w'] = 'picker_open',
       ['o'] = 'macOS_open',
       ['%'] = 'open_vsplit', -- THIS LINE TO BE SPECIFIC
     }
   }

3. Move your cursor upward until it is located at the line containing the substring ['%'].

Expected behaviour

Do nothing.

Actual behaviour

An error occurred:

Error executing vim.schedule lua callback: ...acker/start/lualine.nvim/lua/lualine/utils/nvim_opts.lua:77: E539: Illegal character <'>
stack traceback:
        [C]: in function 'nvim_win_set_option'
        ...acker/start/lualine.nvim/lua/lualine/utils/nvim_opts.lua:77: in function 'setter_fn'
        ...acker/start/lualine.nvim/lua/lualine/utils/nvim_opts.lua:50: in function 'set_opt'
        ...acker/start/lualine.nvim/lua/lualine/utils/nvim_opts.lua:74: in function 'set'
        ...nvim/site/pack/packer/start/lualine.nvim/lua/lualine.lua:422: in function 'refresh'
        ...nvim/site/pack/packer/start/lualine.nvim/lua/lualine.lua:343: in function <...nvim/site/pack/packer/start/lualine.nvim/lua/lualine.lua:342>
Press ENTER or type command to continue

Minimal config to reproduce the issue

use {
  'nvim-lualine/lualine.nvim',
  requires = {
    'kyazdani42/nvim-web-devicons',
    {
      'SmiteshP/nvim-navic',
      requires = 'neovim/nvim-lspconfig',
      config = function () require('nvim-navic').setup{ separator = '  ' } end
    }
  },
  config = function ()
    local navic = require('nvim-navic')
    require('lualine').setup {
      options = {
        theme = 'palenight', -- Purple
      },
      sections = {
        lualine_c = { 'filename', { navic.get_location, cond = navic.is_available } },
        lualine_x = { 'encoding', 'filetype' },
      }
    }
  end
}

Aditional information

Reasoning: I guess the char % might have a special meaning to the next char that follow, thus causing the error. E.g. it escapes the single quote '.

update: This guess got confirmed by the author of lualine.nvim, see here.

and if you look closely, you will also find that the left-curly-braces, i.e. {s, showing in the image is bolded: (ignoring the cat which is from another desktop program.)

[NWang]

@SmiteshP Hi, sorry for tagging you on a closed issue first. But it seems that the problem of bolded left-curly-brace still exists(definitely not a big deal, but I assumed that: I care, you care, we better.):

(sorry for making the two arrows exaggeratedly bolded. I did this because I think it would be more easily seen by any readers. might be offensive for some people so I put a note here.)

And most importantly, thanks for developing this good plugin!

[Smitesh Patil]

@nyngwang Please paste the output of get_location and get_data over here

[Smitesh Patil]

Looking at the photo, that icon looks to be unicode U+F668 (which is default setting of navic).
I don't think any special characters like '%' or curly braces would affect to make half of a unicode character to be bold. Could be an issue with the font or the terminal emulator maybe.
Try pasting U+F668 in the neovim buffer as well and see if it looks similar.

[NWang]

Please paste the output of get_location and get_data over here.

@SmiteshP This is the result of calling get_location(). (I never use get_data)

21:30:39 msg_show  return   use   config   vim.api.nvim_create_autocmd   callback   if   vim.wo.winbar
21:30:40 msg_show  return   use   config   vim.api.nvim_create_autocmd   callback
21:30:40 msg_show  return   use   config   vim.api.nvim_create_autocmd   callback   if   vim.wo.winbar

---

UPDATE:

Try pasting U+F668 in the neovim buffer as well and see if it looks similar.

Exactly :) You have sharp eyes. OK, now I believe this is not related to nvim-navic for sure, sorry for my false alert. I will try a different font or maybe just ignore it.