Custom syntax highlighting not being applied to markdown fenced code about nvim-treesitter HOT 4 CLOSED

I have created a custom vim syntax file, at ~/.config/nvim/syntax/custom1.vim

This has nothing to do with treesitter, and by extension this project.

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(Read the docs re: additional vim highlighting.)

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@clason I took a look at the documentation but, unfortunately, it doesn't seem to be working. I've started trying multiple combinations of the following (now commented out) lines, to see if something would make a difference:

  require'nvim-treesitter.configs'.setup {
    ensure_installed = { "c", "cpp", "lua", "markdown", "markdown_inline", "python", "vim" },
    sync_install = false,
    highlight = {
      enable = true,
      disable = { "latex", },
      --disable = { "markdown,"},
      --disable = {"custom1"},
      ---------------------------------------------------------------------------------------
      --additional_vim_regex_highlighting = { "custom1", "markdown", },
      --additional_vim_regex_highlighting = { "markdown", },
      --additional_vim_regex_highlighting = { "custom1", },
      --additional_vim_regex_highlighting = false,
      --additional_vim_regex_highlighting = true,
    },
  }

At the beginning, actually, it did work only once; unfortunately, I wasn't paying attention and don't know which combination was responsible for it. I've since tried to make it work again, but without success.

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You cannot inject legacy regex highlighting into a tree-sitter parsed buffer. For this to work as expected, you need to disable treesitter for markdown completely and rely on the legacy syntax.

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