Revert "refactor(#2826): move global CURSORS to view member"

This reverts commit d84dfad1c3.

lua/nvim-tree/explorer/view.lua

@@ -19,7 +19,6 @@ local Class = require("nvim-tree.classic")
 ---@field private max_width integer
 ---@field private padding integer
 ---@field private bufnr_by_tabid table<integer, integer> stored per tab until multi-instance is complete
----@field private cursor integer[] as per vim.api.nvim_win_get_cursor
 local View = Class:extend()
 
 ---@class View
@@ -236,12 +235,12 @@ local function switch_buf_if_last_buf()
   end
 end
 
----save any state that should be preserved on reopening
+---save_tab_state saves any state that should be preserved across redraws.
 ---@private
 ---@param tabid integer
 function View:save_tab_state(tabid)
   tabid = tabid or vim.api.nvim_get_current_tabpage()
-  self.cursor = vim.api.nvim_win_get_cursor(self:get_winid(tabid, "View:save_tab_state") or 0)
+  globals.CURSORS[tabid] = vim.api.nvim_win_get_cursor(self:get_winid(tabid, "View:save_tab_state") or 0)
 end
 
 ---@private
@@ -609,9 +608,9 @@ function View:api_winid(opts)
   end
 end
 
---- restore any state from last close
-function View:restore_state()
-  self:set_cursor(self.cursor)
+--- Restores the state of a NvimTree window if it was initialized before.
+function View:restore_tab_state()
+  self:set_cursor(globals.CURSORS[vim.api.nvim_get_current_tabpage()])
 end
 
 --- winid containing the buffer

lua/nvim-tree/globals.lua

@@ -4,6 +4,7 @@ local M = {
   -- from View
   WINID_BY_TABID = {},
   BUFNR_BY_TABID = {},
+  CURSORS = {},
 }
 
 return M

lua/nvim-tree/lib.lua

@@ -135,8 +135,9 @@ function M.open(opts)
     open_view_and_draw()
   end
 
+  -- TODO multi-instance is this actually necessary?
   if explorer then
-    explorer.view:restore_state()
+    explorer.view:restore_tab_state()
   end
 end