Ensure all LSP capabilities are broadcast

lua/plugins/completions.lua

@@ -72,6 +72,10 @@ return {
   },
 
   config = function()
+    local capabilities = vim.lsp.protocol.make_client_capabilities()
+    capabilities = vim.tbl_deep_extend(
+      'force', capabilities, require('cmp_nvim_lsp').default_capabilities())
+
     require('mason').setup()
     require('mason-lspconfig').setup({
       automatic_installation = false,
@@ -81,18 +85,26 @@ return {
         -- Default handler, sets up everything unless a custom language server
         -- setup handler is defined below
         function(server_name)
-          require('lspconfig')[server_name].setup({})
+          require('lspconfig')[server_name].setup({
+            capabilities = capabilities,
+          })
         end,
 
         ['clangd'] = function()
           require('lspconfig').clangd.setup({
-            cmd = { 'clangd', '--completion-style=detailed' }
+            capabilities = capabilities,
+            cmd = {
+              'clangd',
+              '--completion-style=detailed',
+              '--function-arg-placeholders=1',
+            }
           })
         end,
 
         ['lua_ls'] = function()
           require('neodev').setup()
           require('lspconfig').lua_ls.setup({
+            capabilities = capabilities,
             settings = {
               Lua = {
                 diagnostics = {
@@ -106,6 +118,7 @@ return {
 
         ['pyright'] = function()
           require('lspconfig').pyright.setup({
+            capabilities = capabilities,
             settings = {
               pyright = {
                 disableOrganizeImports = true, -- Use ruff import sorter instead