### 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
return _tree_get_selected(false);
}
String FileSystemDock::get_current_path() const {
	return current_path;
}
String FileSystemDock::get_current_directory() const {
	if (current_path.ends_with("/")) {
		return current_path;
	} else {
		return current_path.get_base_dir();
	}
}
void FileSystemDock::_set_current_path_line_edit_text(const String &p_path) {
	if (p_path == "Favorites") {
		current_path_line_edit->set_text(TTR("Favorites"));
	} else {
		current_path_line_edit->set_text(current_path);
	}
}
void FileSystemDock::_navigate_to_path(const String &p_path, bool p_select_in_favorites) {
	if (p_path == "Favorites") {
		current_path = p_path;
	} else {
		String target_path = p_path;
		
		if (target_path.ends_with("/")) {
			target_path = target_path.substr(0, target_path.length() - 1);
		}
		Ref<DirAccess> da = DirAccess::create(DirAccess::ACCESS_RESOURCES);
		if (da->file_exists(p_path)) {