async handler check status before close

lua/navigator/gui.lua

@@ -18,7 +18,7 @@ function M.new_list_view(opts)
 
     if bufnr and vim.api.nvim_buf_is_valid(bufnr) and winnr and vim.api.nvim_win_is_valid(winnr) then
       log('list view already present')
-      return
+      return active_list_view
     end
   end
   local items = opts.items

lua/navigator/reference.lua

@@ -90,7 +90,7 @@ local ref_view = function(err, locations, ctx, cfg)
   local listview = gui.new_list_view(opts)
 
   if listview == nil then
-    vim.notify('failed to create preview windows', vim.lsp.log_levels.WARN)
+    vim.notify('failed to create preview windows', vim.lsp.log_levels.INFO)
     return
   end
   -- trace("update items", listview.ctrl.class)
@@ -127,7 +127,9 @@ local ref_hdlr = mk_handler(function(err, locations, ctx, cfg)
   trace(err, locations, ctx, cfg)
   M.async_hdlr = vim.loop.new_async(vim.schedule_wrap(function()
     ref_view(err, locations, ctx, cfg)
-    M.async_hdlr:close()
+    if M.async_hdlr:is_active() then
+      M.async_hdlr:close()
+    end
   end))
   M.async_hdlr:send()
 end)