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/iterators/node-iterator.lua

@@ -48,7 +48,7 @@ function NodeIterator:recursor(f)
 end
 
 ---@return Node|nil
----@return number
+---@return number|nil
 function NodeIterator:iterate()
   local iteration_count = 0
   local function iter(nodes)