### 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
const String scene_path = make_scene_dialog->get_scene_path();
	int idx = EditorNode::get_singleton()->new_scene();
	EditorNode::get_singleton()->get_editor_data().set_scene_path(idx, scene_path);
	EditorNode::get_singleton()->set_edited_scene(make_scene_dialog->create_scene_root());
	EditorNode::get_singleton()->save_scene_list({ scene_path });
}
void FileSystemDock::_resource_removed(const Ref<Resource> &p_resource) {
	emit_signal(SNAME("resource_removed"), p_resource);
}
void FileSystemDock::_file_removed(String p_file) {
	emit_signal(SNAME("file_removed"), p_file);
	
	current_path = p_file.get_base_dir();
	Ref<DirAccess> da = DirAccess::create(DirAccess::ACCESS_RESOURCES);
	while (!da->dir_exists(current_path)) {
		current_path = current_path.get_base_dir();
	}
	current_path_line_edit->set_text(current_path);
}
void FileSystemDock::_folder_removed(String p_folder) {