refactor(#2826): View is an Explorer member

lua/nvim-tree/diagnostics.lua

@@ -1,6 +1,5 @@
 local core = require("nvim-tree.core")
 local utils = require("nvim-tree.utils")
-local view = require("nvim-tree.view")
 local log = require("nvim-tree.log")
 
 local DirectoryNode = require("nvim-tree.node.directory")
@@ -182,10 +181,15 @@ function M.update_coc()
     end
     log.profile_end(profile)
 
-    local bufnr = view.View:get_bufnr()
+    local explorer = core.get_explorer()
+
+    local bufnr
+    if explorer then
+      bufnr = explorer.view:get_bufnr()
+    end
+
     local should_draw = bufnr and vim.api.nvim_buf_is_valid(bufnr) and vim.api.nvim_buf_is_loaded(bufnr)
     if should_draw then
-      local explorer = core.get_explorer()
       if explorer then
         explorer.renderer:draw()
       end