### 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
}
			}
			if (!to_move.is_empty()) {
				if (Input::get_singleton()->is_key_pressed(Key::CTRL)) {
					_move_operation_confirm(to_dir, true);
				} else {
					_move_operation_confirm(to_dir);
				}
			}
		} else if (favorite) {
			
			Vector<String> fnames = drag_data["files"];
			Vector<String> favorites_list = EditorSettings::get_singleton()->get_favorites();
			for (int i = 0; i < fnames.size(); i++) {
				if (!favorites_list.has(fnames[i])) {
					favorites_list.push_back(fnames[i]);
				}
			}
			EditorSettings::get_singleton()->set_favorites(favorites_list);
			_update_tree(get_uncollapsed_paths());
		}
	}
	if (drag_data.has("type") && String(drag_data["type"]) == "nodes") {
		String to_dir;
		bool favorite;
		_get_drag_target_folder(to_dir, favorite, p_point, p_from);
		SceneTreeDock::get_singleton()->save_branch_to_file(to_dir);
	}
}
void FileSystemDock::_get_drag_target_folder(String &target, bool &target_favorites, const Point2 &p_point, Control *p_from) const {