[BUG]: widgets.sidebar.toggle() causes incremental lag (js-debug-adapter)

[serranomorante]

Debug adapter definition and debug configuration

Notice how toggling the sidebar gets more and more slow (I'm toggling it at a fast speed but it doesn't respond)

nvim-dap-sidebar-2024-03-23_21.54.13.webm

Debug adapter version

js-debug-adapter 1.88.0
nvim nightly

Steps to Reproduce

Create and start a dummy react app (javascript)

npx create-react-app my-app
cd my-app
npm start

Reproduction steps on Neovim

Copy the repro.lua code snippet and open nvim with nvim --clean +'so repro.lua' and wait for nvim plugins to get automatically installed
Install js-debug-adapter with MasonInstall js-debug-adapter
Open the App.js file on my-app/src/App.js
Set a breakpoint on the return statement with lua require'dap'.toggle_breakpoint()
Start the debug session with lua require'dap'.continue()
Start toggling the sidebar with <leader>ds. Repeat this keymap and you will notice the slow down.

-- DO NOT change the paths
local root = vim.fn.fnamemodify("./.repro", ":p")
root = root:sub(-1) == "/" and root or root .. "/"
-- set stdpaths to use .repro
for _, name in ipairs({ "config", "data", "state", "cache" }) do
  vim.env[("XDG_%s_HOME"):format(name:upper())] = root .. name
end

vim.g.mapleader = " "

--------------------------------------------------------------------------------

local plugins = {
  {
    "williamboman/mason.nvim",
    lazy = false,
    cmd = "Mason",
    opts = {
      ui = {
        check_outdated_packages_on_open = false,
        keymaps = {
          update_all_packages = "noop",
        },
      },
      install_root_dir = root .. "/mason",
    },
  },
  {
    "mfussenegger/nvim-dap",
    config = function()
      local dap = require("dap")
      local mason_registry = require("mason-registry")
      local vscode_js_debug_dap = mason_registry.get_package("js-debug-adapter")
      if vscode_js_debug_dap then
        local dap_executable = vscode_js_debug_dap:get_install_path() .. "/js-debug/src/dapDebugServer.js"

        for _, type in ipairs({
          "node",
          "chrome",
          "pwa-node",
          "pwa-chrome",
          "pwa-msedge",
          "node-terminal",
          "pwa-extensionHost",
        }) do
          local host = "localhost"
          dap.adapters[type] = {
            type = "server",
            host = host,
            port = "${port}",
            executable = {
              command = "node",
              args = { dap_executable, "${port}", host },
            },
          }
        end

        for _, language in ipairs({ "typescript", "javascript", "javascriptreact", "typescriptreact" }) do
          dap.configurations[language] = {
            {
              name = "Test react app",
              type = "pwa-chrome",
              request = "launch",
              url = "http://localhost:3000",
              webRoot = "${workspaceFolder}",
              userDataDir = false,
            },
          }
        end
      end

      local widgets = require("dap.ui.widgets")
      local scopes_sidebar = widgets.sidebar(widgets.scopes, { number = true, wrap = false })
      vim.keymap.set("n", "<leader>ds", scopes_sidebar.toggle, { desc = 'DAP: Toggle "scopes" in sidebar' })
    end,
  },
}

--------------------------------------------------------------------------------

local lazypath = root .. "/plugins/lazy.nvim"
---@diagnostic disable-next-line: undefined-field
if not (vim.uv or 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.runtimepath:prepend(lazypath)
require("lazy").setup(plugins, {
  root = root .. "/plugins",
})

Expected Result

Toggling shouldn't get more slow the more you execute it

Actual Result

Toggling the sidebar get more slow the more you use it

[serranomorante]

This issue was mentioned on this discussion: #1171

[mfussenegger]

Looks like this might be a js-debug-adapter specific issue, see: microsoft/vscode-js-debug#2119

[serranomorante]

Looks like this might be a js-debug-adapter specific issue, see: microsoft/vscode-js-debug#2119

Is it? I'm still able to reproduce it even after installing the vscode-js-debug commit that supposedly fixes the performance issue 😢