nvim: lsp: Drop lsp_signature

The signature help sometimes stays open even after moving away from
the function. Sometimes it conflicts with the auto completion pop-up
making it difficult to see one of the two windows.

nvim/.config/nvim/lua/lsp.lua

@@ -1,6 +1,5 @@
 local nvim_lsp   = require 'lspconfig'
 local protocol   = require 'vim.lsp.protocol'
-local signature  = require 'lsp_signature'
 local ts_utils   = require 'nvim-lsp-ts-utils'
 local null_ls    = require 'null-ls'
 local util       = require 'lspconfig/util'
@@ -91,14 +90,6 @@ local ts_utils_setup = function(client, bufnr, opts)
 end
 
 local on_attach = function(client, bufnr)
-  signature.on_attach({
-    bind         = true,
-    hint_enable  = true,
-    hint_prefix  = "🐼 ",
-    hint_scheme  = "String",
-    handler_opts = { border = "single" },
-    decorator    = {"`", "`"}
-  })
   vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')
   vim.lsp.set_log_level('warn')
 
@@ -119,6 +110,7 @@ local on_attach = function(client, bufnr)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gR'       , '<cmd>lua vim.lsp.buf.rename()<CR>'           , opts)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', 'pd'       , '<cmd>lua PeekDefinition()<CR>'               , opts)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', '<Leader>k', '<cmd>lua vim.lsp.buf.hover()<CR>'            , opts)
+  vim.api.nvim_buf_set_keymap(bufnr, 'n', '<Leader>S', '<cmd>lua vim.lsp.buf.signature_help()<CR>'   , opts)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', 'ga'       , '<cmd>lua vim.lsp.buf.code_action()<CR>'      , opts)
   vim.api.nvim_buf_set_keymap(bufnr, 'v', 'ga'       , '<cmd>lua vim.lsp.buf.range_code_action()<CR>', opts)
 

nvim/.config/nvim/lua/plugins.lua

@@ -81,7 +81,6 @@ local init = function ()
   -- LSP
   use {
     'neovim/nvim-lspconfig',
-    'ray-x/lsp_signature.nvim',
     'kosayoda/nvim-lightbulb',
   }
   -- Language support & syntax highlighting