help: Code Border is White With Some Colorschemes

[mabourehab]

Neovim version (nvim -v)

v0.11.3

Neovim distribution

LazyVim

Description

I have a question about code borders with some colorschemes. Below is a screenshot of me trying to use the duskfox colorscheme and the border for the code becomes a thick white line.

It looks like it's highlighting the '█', which is the default border with white. However, if I type:

:highlight Render

and press tab to try and find RenderMarkdownCodeBorder, it's not there.

Here is the output of :RenderMarkdown debug on one of the lines:

marks on row: 31                                                                                                                                                                    
=========================================================================================================================================================================================== 
row: 31                                                                                                                                                                                     
column: 0                                                                                                                                                                                   
hide: false                                                                                                                                                                                 
  virt_text: ( , DevIconBash+RmCodeBorder) + (bash, DevIconBash+RmCodeBorder) + (rep(█, 125), Rm_RmCodeBorder_bg_as_fg)                                                                    
  virt_text_pos: overlay                                                                                                                                                                    
=========================================================================================================================================================================================== 
row: 31                                                                                                                                                                                     
column: 0                                                                                                                                                                                   
hide: false                                                                                                                                                                                 
  sign_text:                                                                                                                                                                               
  sign_hl_group: Rm_DevIconBash_RmSign                                                                                                                                                      
=========================================================================================================================================================================================== 
row: 31 -> 31                                                                                                                                                                               
column: 0 -> 3                                                                                                                                                                              
hide: true                                                                                                                                                                                  
  conceal: ""                                                                                                                                                                               
=========================================================================================================================================================================================== 
row: 31 -> 31                                                                                                                                                                               
column: 3 -> 7                                                                                                                                                                              
hide: true                                                                                                                                                                                  
  conceal: ""     

This is of course fixed is if I change highlight_border to false, but I would like to keep the border if possible. I'm just not understanding why some colorschemes do this and some don't.

Here is also my config:

	{
		"MeanderingProgrammer/render-markdown.nvim",
		main = "render-markdown",
		name = "render-markdown",
		dependencies = {
			"nvim-treesitter/nvim-treesitter",
			"nvim-tree/nvim-web-devicons",
		},
		opts = {},
		config = function()
			require("render-markdown").setup({
				render_modes = true,
				win_options = {
					concealcursor = { rendered = "nvc" },
				},
				anti_conceal = {
					enabled = true,
					ignore = {
						code_background = true,
						code_border = true,
						code_language = true,
						head_icon = true,
						head_background = true,
						head_border = true,
						sign = true,
						dash = true,
						bullet = true,
					},
				},
				code = {
					style = "full",
					language_name = true,
					border = "thin",
					width = "block",
					-- highlight_border = false,
				},
				heading = {
					backgrounds = {},
				},
			})
		end,
	},

Would appreciate some insight. Thanks!

[MeanderingProgrammer]

So the kind of filler / border highlights are definitely the most strange part of how this plugin handles colors, and the white color can sometimes happen.

Because you're using LazyVim you could potentially be having a problem with the markdown extra. My plugin ships with that extra and LazyVim is setup to lazy load my plugin, which could be preventing you from seeing the highlight group.

So I would open up a markdown file first, then you should be able to get the highlight value for RenderMarkdownCodeBorder, i.e. :highlight RenderMarkdownCodeBorder.

The value used for the block character is computed from RenderMarkdownCodeBorder. Specifically a new highlight group is generated which uses the background value of RenderMarkdownCodeBorder as the foreground value, essentially it inverts the base highlight group.

As a result if RenderMarkdownCodeBorder doesn't have a bg value you'll get a white color like this. You can check this by running: :lua vim.print(vim.api.nvim_get_hl(0, { name ='RenderMarkdownCodeBorder', link = false }))

[MeanderingProgrammer]

Feel free to re-open if you have any followup questions!