Flickering background in Quarto cells

[andy941]

Hi,
I love the plugin, it makes a pleasure to work with Quarto files (I use it mainly for data science at work). I have an annoying issue where the cells background is unset in random amount of lines when another highlight is on, or that is what my debugging got me to. See below an example of the type of flickering I get:
normal highlight

broken by Illuminate (see the two lemur_residuals)

These are actually very sudden and I am not sure what they are related to (cursor is on a white space, maybe the IndentBlankline plugin?):

All this flickers constantly while moving the cursor around but I can't figure out why exactly. My guess is that happens when something else sets a background inside the cell? Disabling VimIlluminate for example solves that specific type of flickering.

Changing colorscheme to a default one does not help.

My headlines.nvim config:

require("headlines").setup({
	quarto = {
		query = vim.treesitter.query.parse(
			"markdown",
			[[
        (atx_heading [
          (atx_h1_marker)
          (atx_h2_marker)
          (atx_h3_marker)
          (atx_h4_marker)
          (atx_h5_marker)
          (atx_h6_marker)
        ] @headline)

        (thematic_break) @dash

        (fenced_code_block) @codeblock

        (block_quote_marker) @quote
        (block_quote (paragraph (inline (block_continuation) @quote)))
        (block_quote (paragraph (block_continuation) @quote))
        (block_quote (block_continuation) @quote)
      ]]
		),
		headline_highlights = { "Headline" },
		bullet_highlights = {
			"@text.title.1.marker.markdown",
			"@text.title.2.marker.markdown",
			"@text.title.3.marker.markdown",
			"@text.title.4.marker.markdown",
			"@text.title.5.marker.markdown",
			"@text.title.6.marker.markdown",
		},
		treesitter_language = "markdown",
		bullets = { "◉", "○", "✸", "✿" },
		codeblock_highlight = "CodeBlock",
		dash_highlight = "Dash",
		dash_string = "-",
		quote_highlight = "Quote",
		quote_string = "┃",
		fat_headlines = true,
		fat_headline_upper_string = "▃",
		fat_headline_lower_string = "🬂",
	},
})

The code in the pictures:

#| label: plotting
#| echo: true
#| output-location: slide
#| message: false
#| fig-align: center
#| fig-alt: "Scatter plot of predicted and residual values for the fitted linear model."
library(reticulate)
library(ggplot2)
lemur_residuals <- py$lemur_data_py
ggplot(
  data = lemur_residuals,
  mapping = aes(
    x = Predicted,
    y = Residuals
  )
) +
  geom_point(colour = "#2F4F4F") +
  geom_hline(
    yintercept = 0,
    colour = "red"
  ) +
  theme(
    panel.background = element_rect(
      fill = "#eaf2f2",
      colour = "#eaf2f2"
    ),
    plot.background = element_rect(
      fill = "#eaf2f2",
      colour = "#eaf2f2"
    )
  )

Do you have an idea on what is going on?

[lukas-reineke]

I cannot reproduce this.

Can you use this template and steps to cause the issue?

local lazypath = "/tmp/lazy/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
    vim.fn.system { "git", "clone", "--filter=blob:none", "https://github.com/folke/lazy.nvim.git", "--branch=stable", lazypath }
end
vim.opt.rtp:prepend(lazypath)
vim.opt.termguicolors = true

require("lazy").setup ({
    {
        "lukas-reineke/headlines.nvim",
        config = function()
            require("headlines").setup {}
        end,
    },
}, { root = "/tmp/lazy" })

[andy941]

Still see a flickering in this very simple example:

only when the cursor is on one of the parenthesis.
I had to expand the minimal config a little bit to work with quarto:

local lazypath = "/tmp/lazy/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
	vim.fn.system { "git", "clone", "--filter=blob:none", "https://github.com/folke/lazy.nvim.git", "--branch=stable", lazypath }
end
vim.opt.rtp:prepend(lazypath)
vim.opt.termguicolors = true

require("lazy").setup ({
	{
		"lukas-reineke/headlines.nvim",
		config = function()
			require("headlines").setup {
				quarto = {
					query = vim.treesitter.query.parse(
					"markdown",
					[[
					(atx_heading [
					(atx_h1_marker)
					(atx_h2_marker)
					(atx_h3_marker)
					(atx_h4_marker)
					(atx_h5_marker)
					(atx_h6_marker)
					] @headline)

					(thematic_break) @dash

					(fenced_code_block) @codeblock

					(block_quote_marker) @quote
					(block_quote (paragraph (inline (block_continuation) @quote)))
					(block_quote (paragraph (block_continuation) @quote))
					(block_quote (block_continuation) @quote)
					]]
					),
					headline_highlights = { "Headline" },
					bullet_highlights = {
						"@text.title.1.marker.markdown",
						"@text.title.2.marker.markdown",
						"@text.title.3.marker.markdown",
						"@text.title.4.marker.markdown",
						"@text.title.5.marker.markdown",
						"@text.title.6.marker.markdown",
					},
					treesitter_language = "markdown",
					bullets = { "◉", "○", "✸", "✿" },
					codeblock_highlight = "CodeBlock",
					dash_highlight = "Dash",
					dash_string = "-",
					quote_highlight = "Quote",
					quote_string = "┃",
					fat_headlines = true,
					fat_headline_upper_string = "▃",
					fat_headline_lower_string = "🬂",
				},
			}
		end,
		dependencies = {"nvim-treesitter/nvim-treesitter"},
	},
}, { root = "/tmp/lazy" })

I can't reproduce the other bugs with the minimal config.

Let me know if this helps.

[andy941]

@lukas-reineke
Any thoughts? Can I help with more tests?