refactor(#2886): multi instance: node class refactoring: DirectoryNode:expand_or_collapse (#2957)

move expand_or_collapse to DirectoryNode

lua/nvim-tree/node/directory.lua

@@ -116,6 +116,35 @@ function DirectoryNode:get_git_status()
   end
 end
 
+function DirectoryNode:expand_or_collapse(toggle_group)
+  toggle_group = toggle_group or false
+  if self.has_children then
+    self.has_children = false
+  end
+
+  if #self.nodes == 0 then
+    self.explorer:expand(self)
+  end
+
+  local head_node = self:get_parent_of_group()
+  if toggle_group then
+    head_node:toggle_group_folders()
+  end
+
+  local open = self:last_group_node().open
+  local next_open
+  if toggle_group then
+    next_open = open
+  else
+    next_open = not open
+  end
+  for _, n in ipairs(head_node:get_all_nodes_in_group()) do
+    n.open = next_open
+  end
+
+  self.explorer.renderer:draw()
+end
+
 ---Create a sanitized partial copy of a node, populating children recursively.
 ---@return DirectoryNode cloned
 function DirectoryNode:clone()

lua/nvim-tree/node/init.lua

@@ -225,36 +225,6 @@ function BaseNode:ungroup_empty_folders()
   end
 end
 
-function BaseNode:expand_or_collapse(toggle_group)
-  toggle_group = toggle_group or false
-  if self.has_children then
-    ---@cast self DirectoryNode -- TODO #2886 move this to the class
-    self.has_children = false
-  end
-
-  if #self.nodes == 0 then
-    self.explorer:expand(self)
-  end
-
-  local head_node = self:get_parent_of_group()
-  if toggle_group then
-    head_node:toggle_group_folders()
-  end
-
-  local open = self:last_group_node().open
-  local next_open
-  if toggle_group then
-    next_open = open
-  else
-    next_open = not open
-  end
-  for _, n in ipairs(head_node:get_all_nodes_in_group()) do
-    n.open = next_open
-  end
-
-  self.explorer.renderer:draw()
-end
-
 ---Create a sanitized partial copy of a node, populating children recursively.
 ---@return BaseNode cloned
 function BaseNode:clone()