Fix keymap buffer (#223)

* apply key mapping to selected buffer only

* <help> filetype should not be handled by navigator

Co-authored-by: spike <spike@w530>

lua/navigator/lspclient/clients.lua

@@ -42,6 +42,7 @@ local disabled_ft = {
   'windline',
   'notify',
   'nofile',
+  'help',
   '',
 }
 -- local cap = vim.lsp.protocol.make_client_capabilities()

lua/navigator/lspclient/mapping.lua

@@ -216,6 +216,7 @@ local function set_mapping(lsp_attach_info)
       if value.desc then
         opts.desc = value.desc
       end
+      opts.buffer = bufnr
       vim.keymap.set(value.mode or 'n', value.key, value.func, opts)
       if string.find(value.desc, 'range format') and value.mode == 'v' then
         rfmtkey = value.key