### 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
String new_path;
	String new_path_base;
	if (p_entry.is_file) {
		new_path = p_at_path.path_join(p_entry.path.get_file());
		new_path_base = new_path.get_basename() + " (%d)." + new_path.get_extension();
	} else {
		PackedStringArray path_split = p_entry.path.split("/");
		new_path = p_at_path.path_join(path_split[path_split.size() - 2]);
		new_path_base = new_path + " (%d)";
	}
	int exist_counter = 1;
	Ref<DirAccess> da = DirAccess::create(DirAccess::ACCESS_RESOURCES);
	while (da->file_exists(new_path) || da->dir_exists(new_path)) {
		exist_counter++;
		new_path = vformat(new_path_base, exist_counter);
	}
	return new_path;
}
void FileSystemDock::_update_favorites_list_after_move(const HashMap<String, String> &p_files_renames, const HashMap<String, String> &p_folders_renames) const {