fix(session): try to minimize error when switching sessions

NOTE:
- single tab session switching now work as expected without error
- inactive tab won't be saved and restored as `scope.nvim` is making those buffer unlisted
  - also some error might occur when restoring (e.g. bufnr xxx does not exist)
- resolve incorrect cwd when loading session, which is caused by `ProjectRoot` called too fast

TODO:
- multiple tab session support

config/nvim/lua/plugins/init.lua

@@ -107,10 +107,10 @@ return {
 
   {
     "ahmedkhalf/project.nvim",
-    event = "LazyFile",
+    cmd = "ProjectRoot",
     config = function()
       require("project_nvim").setup {
-        -- manual_mode = true,
+        manual_mode = true,
         ignore_lsp = { "null-ls", "copilot" },
       }
       require("core.utils").on_load("telescope.nvim", function()

config/nvim/lua/plugins/session.lua

@@ -3,9 +3,15 @@
 
 local M = {
   "Shatur/neovim-session-manager",
+  dependencies = "scope.nvim",
   cmd = "SessionManager",
+  event = "LazyFile",
 }
 
+M.init = function()
+  vim.opt.sessionoptions = "curdir,tabpages,winsize,globals,buffers"
+end
+
 M.config = function()
   -- vim.api.nvim_create_autocmd("User", {
   --   pattern = "SessionLoadPost",
@@ -16,7 +22,28 @@ M.config = function()
 
   require("session_manager").setup {
     autoload_mode = require("session_manager.config").AutoloadMode.Disabled,
+    -- autosave_last_session = false,
   }
+
+  local group = vim.api.nvim_create_augroup("dotfiles_session_manager", {})
+
+  vim.api.nvim_create_autocmd("VimLeavePre", {
+    group = group,
+    callback = function()
+      vim.cmd.ProjectRoot()
+      vim.cmd.ScopeSaveState()
+      require("session_manager").save_current_session()
+    end,
+  })
+
+  vim.api.nvim_create_autocmd({ "User" }, {
+    pattern = "SessionSavePost",
+    group = group,
+    callback = function()
+      -- so switching between projects doesn't mess up lsp related stuff (e.g. semantic tokens)
+      pcall(vim.cmd.LspStop)
+    end,
+  })
 end
 
 return M