feat(lsp): enable LSP folds when available

lua/lazyvim/plugins/lsp/init.lua

@@ -45,6 +45,12 @@ return {
         codelens = {
           enabled = false,
         },
+        -- Enable this to enable the builtin LSP folding on Neovim.
+        -- Be aware that you also will need to properly configure your LSP server to
+        -- provide the folds.
+        folds = {
+          enabled = true,
+        },
         -- add any global capabilities here
         capabilities = {
           workspace = {
@@ -137,6 +143,14 @@ return {
         end)
       end
 
+      -- folds
+      if opts.folds.enabled then
+        LazyVim.lsp.on_supports_method("textDocument/foldingRange", function(client, buffer)
+          local win = vim.api.nvim_get_current_win()
+          vim.wo[win][0].foldexpr = "v:lua.vim.lsp.foldexpr()"
+        end)
+      end
+
       -- code lens
       if opts.codelens.enabled and vim.lsp.codelens then
         LazyVim.lsp.on_supports_method("textDocument/codeLens", function(client, buffer)