change_root_to_node() does not work on files

[BenjaminHao]

Description

According to the help file, change_root_to_node will change the tree's root to a folder node or the parent of a file node.
However, it only works when I put cursor on a folder. If the cursor is on a file, it does not set the tree's root to its current folder.

Neovim version

NVIM v0.9.5
Build type: RelWithDebInfo
LuaJIT 2.1.1703942320

Operating system and version

Windows 11

Windows variant

No response

nvim-tree version

master branch

Clean room replication

No need config
default keymap is <C-]>

Steps to reproduce

1. nvim -nu /tmp/nvt-min.lua
2. :NvimTreeOpen
3. Press <-> to go up
4. select any file
5. Press <C-]> to change root to node

Expected behavior

root directory changes to the file's folder

Actual behavior

Nothing happens

[alex-courtis]

Working as intended; change_root_to_node only functions for root and directory nodes.

Other functions such as paste do work on file nodes. This should be consistent. This can be classed as a bug fix.

Api.tree.change_root_to_node logic should be moved into actions.root.change_dir.fn

As usual, pull requests are most gratefully appreciated, see CONTRIBUTING.md