### Godot version

v4.1.rc2.official [46424488e]

### System information

Godot v4.1.rc2 - Linux Mint 20 (Ulyana) - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2060 SUPER (nvidia; 515.105.01) - Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz (8 Threads)

### Issue description

Dragging and dropping a file to a new position inside its current folder, or onto the icon for its current folder - when that folder is the project root folder :res// - will be treated as though you were dropping a different file with the same name.

Expectation: for nothing to happen.

Also tried it in 4.0.3 and 4.1-dev3, where it behaves as expected.

https://github.com/godotengine/godot/assets/64640811/90de1120-dd92-41b8-b202-db77c343103a

### Steps to reproduce

1. New or existing project.
2. Click and drag a file in :res// in FileSystem dock.
3. Drop the file back into :res//.
4. Be prompted to overwrite or rename.

### Minimal reproduction project

N/A
HashMap<String, String> &p_file_renames, HashMap<String, String> &p_folder_renames) {
	
	String old_path = (p_item.is_file || p_item.path.ends_with("/")) ? p_item.path : (p_item.path + "/");
	String new_path = (p_item.is_file || p_new_path.ends_with("/")) ? p_new_path : (p_new_path + "/");
	if (new_path == old_path) {
		return;
	} else if (old_path == "res://") {
		EditorNode::get_singleton()->add_io_error(TTR("Cannot move/rename resources root."));
		return;
	} else if (!p_item.is_file && new_path.begins_with(old_path)) {
		
		EditorNode::get_singleton()->add_io_error(TTR("Cannot move a folder into itself.") + "\n" + old_path + "\n");
		return;
	}
	
	Vector<String> file_changed_paths;
	Vector<String> folder_changed_paths;
	if (p_item.is_file) {
		file_changed_paths.push_back(old_path);
	} else {
		folder_changed_paths.push_back(old_path);