[Feature Request] LSP semantic highlighting support

[alexmozaidze]

Normally, highlighting is ok, but when an LSP kicks in, it recolors some of the identifiers wrongly (mainly variables)

Before LSP:

After LSP:

[alexmozaidze]

I did some research. I found out that the issue was the semantic highlighting of the LSP.
In order to disable them, put this snippet in your init.lua

vim.api.nvim_create_autocmd({ "ColorScheme" }, {
  callback = function()
    -- Hide semantic highlights for functions
    vim.api.nvim_set_hl(0, '@lsp.type.function', {})

    -- Hide all semantic highlights
    for _, group in ipairs(vim.fn.getcompletion("@lsp", "highlight")) do
      vim.api.nvim_set_hl(0, group, {})
    end
  end,
})

This snippet was basically a copy-paste from :h lsp-semantic-highlight into an autocmd; it also contains info on doing the highlighting.