refactor(#2942): multi instance: move find_node_line to Explorer

lua/nvim-tree/actions/moves/item.lua

@@ -191,7 +191,7 @@ local function move_prev_recursive(explorer, what, skip_gitignored)
       if node_init.name == ".." then -- root node
         view.set_cursor({ 1, 0 })    -- move to root node (position 1)
       else
-        local node_init_line = utils.find_node_line(node_init)
+        local node_init_line = explorer:find_node_line(node_init)
         if node_init_line < 0 then
           return
         end

lua/nvim-tree/explorer/init.lua

@@ -551,6 +551,27 @@ function Explorer:place_cursor_on_node()
   end
 end
 
+-- Find the line number of a node.
+---@param node Node?
+---@return integer -1 not found
+function Explorer:find_node_line(node)
+  if not node then
+    return -1
+  end
+
+  local first_node_line = core.get_nodes_starting_line()
+  local nodes_by_line = utils.get_nodes_by_line(self.nodes, first_node_line)
+  local iter_start, iter_end = first_node_line, #nodes_by_line
+
+  for line = iter_start, iter_end, 1 do
+    if nodes_by_line[line] == node then
+      return line
+    end
+  end
+
+  return -1
+end
+
 ---Api.tree.get_nodes
 ---@return nvim_tree.api.Node
 function Explorer:get_nodes()

lua/nvim-tree/utils.lua

@@ -134,28 +134,6 @@ function M.find_node(nodes, fn)
   return node, i
 end
 
--- Find the line number of a node.
--- Return -1 is node is nil or not found.
----@param node Node?
----@return integer
-function M.find_node_line(node)
-  if not node then
-    return -1
-  end
-
-  local first_node_line = require("nvim-tree.core").get_nodes_starting_line()
-  local nodes_by_line = M.get_nodes_by_line(require("nvim-tree.core").get_explorer().nodes, first_node_line)
-  local iter_start, iter_end = first_node_line, #nodes_by_line
-
-  for line = iter_start, iter_end, 1 do
-    if nodes_by_line[line] == node then
-      return line
-    end
-  end
-
-  return -1
-end
-
 ---@param extmarks vim.api.keyset.get_extmark_item[] as per vim.api.nvim_buf_get_extmarks
 ---@return number
 function M.extmarks_length(extmarks)