fix(renderer): use winsaveview/winrestview to restore cursor as well

We can use `lnum` from winsaveview to set our cursor and not depend
on M.follow_focus and state.tree.get_node (which can be nil sometimes).

This way we don't trigger M.follow_focus window centering algorithm when
expanding or closing nodes.

lua/neo-tree/ui/renderer.lua

@@ -640,15 +640,12 @@ end
 M.position = {
   save = function(state)
     if state.tree and M.window_exists(state) then
-      local success, node = pcall(state.tree.get_node, state.tree)
-      if success and node then
-        _, state.position.node_id = pcall(node.get_id, node)
-        local win_state = vim.api.nvim_win_call(state.winid, vim.fn.winsaveview)
-        log.trace("win_state: " .. vim.inspect(win_state))
-        state.position.topline = win_state.topline
-        log.debug("Saved cursor position with node_id: " .. state.position.node_id)
-        log.debug("Saved window position with topline: " .. state.position.topline)
-      end
+      local win_state = vim.api.nvim_win_call(state.winid, vim.fn.winsaveview)
+      log.trace("win_state: " .. vim.inspect(win_state))
+      state.position.topline = win_state.topline
+      state.position.lnum = win_state.lnum
+      log.debug("Saved cursor position with lnum: " .. state.position.lnum)
+      log.debug("Saved window position with topline: " .. state.position.topline)
       -- Only need to restore the cursor state once per save, comes
       -- into play when some actions fire multiple times per "iteration"
       -- within the scope of where we need to perform the restore operation
@@ -663,17 +660,12 @@ M.position = {
     state.position.is.restorable = true
   end,
   restore = function(state)
-    if not state.position.node_id then
-      log.debug("No node_id to restore to")
-      return
-    end
     if state.position.is.restorable then
-      log.debug("Restoring cursor position to node_id: " .. state.position.node_id)
-      M.focus_node(state, state.position.node_id, true)
-      if state.position.topline then
+      if state.position.topline and state.position.lnum then
         log.debug("Restoring window position to topline: " .. state.position.topline)
+        log.debug("Restoring cursor position to lnum: " .. state.position.lnum)
         vim.api.nvim_win_call(state.winid, function()
-          vim.fn.winrestview({ topline = state.position.topline })
+          vim.fn.winrestview({ topline = state.position.topline, lnum = state.position.lnum })
         end)
       end
     else