refactor(#2826): multi instance nvim-tree.view

lua/nvim-tree/actions/tree/find-file.lua

@@ -1,6 +1,5 @@
 local core = require "nvim-tree.core"
 local lib = require "nvim-tree.lib"
-local view = require "nvim-tree.view"
 local finders_find_file = require "nvim-tree.actions.finders.find-file"
 
 local M = {}
@@ -41,11 +40,12 @@ function M.fn(opts)
     return
   end
 
-  if view.is_visible() then
+  local explorer = core.get_explorer()
+  if explorer and explorer.view:is_visible() then
     -- focus
     if opts.focus then
       lib.set_target_win()
-      view.focus()
+      explorer.view:focus()
     end
   elseif opts.open then
     -- open