revert(#3180, #3177): resolve live filter failures (#3183)

* Revert "fix(#3172): live filter exception (#3173)"

This reverts commit 0a7fcdf3f8.

* Revert "refactor(#2826): move view to instanced window class (#3153)"

This reverts commit 0a06f65bf0.

* feat(#3157): add view.cursorlineopt

lua/nvim-tree/actions/tree/open.lua

@@ -1,5 +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 = {}
@@ -23,12 +23,10 @@ function M.fn(opts)
     opts.path = nil
   end
 
-  local explorer = core.get_explorer()
-
-  if explorer and explorer.view:is_visible() then
+  if view.is_visible() then
     -- focus
     lib.set_target_win()
-    explorer.view:focus()
+    view.focus()
   else
     -- open
     lib.open({