bug: Headlines Not Displaying Correctly in Quarto Files (.qmd)

[bassamsdata]

Neovim version (nvim -v)

0.10.0

Operating system

MacOS

Terminal emulator / GUI

WezTerm

Describe the bug

Headlines don't appear correctly in Quarto files (.qmd). The more nested the headlines are, the more letters are hidden from the beginning of the line. The video below illustrates the issue clearly.

Expected behavior

show the headlines correctly.

to reproduce:

1. create quarto file: touch testQuarto.qmd
2. paste the below code in it.

   
   ---
   title: "Premier League clubs best and worst seasons"
   format:
   html:
   code-fold: true
   code-link: true
   code-summary: "Show the code"
   code-tools: true
   theme:
     light: cosmo
     dark: darkly
   execute:
   echo: fenced
   ---

Create a chart for clubs

chart to look for best and worst seasons based on points, gF, gA, xgF, xgA

Load libraries

Load libraries

### Healthcheck output (:checkhealth render-markdown)

render-markdown: require("render-markdown.health").check()

markdown.nvim [nvim-treesitter] ~
- OK installed
- OK markdown: parser installed
- OK markdown_inline: parser installed
- WARNING latex: parser not installed
  - ADVICE:
    - If you do not want LaTeX support avoid this warning by setting { latex_enabled = false }
- OK highlights enabled

markdown.nvim [executables] ~
- WARNING latex2text: not installed
  - ADVICE:
    - If you do not want LaTeX support avoid this warning by setting { latex_enabled = false }

markdown.nvim [configuration] ~
- ERROR Invalid key: file_types.2
- ERROR Invalid key: file_types.3

### Additional information

here is my config:
```r
  {
    "MeanderingProgrammer/markdown.nvim",
    ft = { "markdown", "rmd", "quarto" },
    name = "render-markdown",
    dependencies = { "nvim-treesitter/nvim-treesitter" },
    opts = {
      file_types = { "markdown", "rmd", "quarto" },
    },
  },

Thank you

[MeanderingProgrammer]

I think I know what's going on here.

This plugin assumes default conceal behavior in markdown files. Currently the heading prefix ###, is not concealed by default.

Do you have any custom highlights that set conceal on atx_h1_marker etc.?

[bassamsdata]

Thank you for the response, and yes, you’re right. There was some highlighting related to atx_h1_marker as shown in the Inspect command image below:

After debugging, I discovered the issue was due to enabling regex highlights in Markdown files via Tree-sitter with additional_vim_regex_highlighting = { "markdown" },. What struck me was that the issue didn't appear in Markdown files, only in Quarto files.

Thank you again for your reply; the issue is now resolved.

[MeanderingProgrammer]

Strange, it does seem like this should also have been an issue on markdown files.

Will work on handling these cases better in general, assuming concealing behavior is going to lead to inconsistencies, though I'm not sure of a better way to handle it at the moment.

Glad it's working now!

[MeanderingProgrammer]

I did push a fix for this here https://github.com/MeanderingProgrammer/markdown.nvim/commit/5ce35662725b1024c6dddc8d0bc03befc5abc878, if you want to re-enable the concealing behavior and are using neovim >= 0.10.0.