Import timetable "undo" does not work

[leslieyip02]

Describe the bug

After importing a timetable shared via URL, the "UNDO" button in the notifcation does not undo the import.

To Reproduce

Steps to reproduce the behavior:

1. Go to the "Timetable" tab and click the share "Share/Sync" button
2. Copy the URL, and open it in a different window
3. Click "Import"
4. Wait for the notification and click "UNDO"

Expected behavior

The undo button should reset the timetable to the previously saved state.

Video

undo-bug.mp4

Desktop (please complete the following information):

• OS: Windows 11
• Browser: Tested on Chrome and Firefox
• Version: 22H2

Additional context

This is where the "undo" notifcation is dispatched:

nusmods/website/src/views/timetable/TimetableContainer.tsx

Lines 60 to 69 in b7c679e

	dispatch(
	openNotification('Timetable imported', {
	timeout: 12000,
	overwritable: true,
	action: {
	text: 'Undo',
	handler: () => dispatch(undo) as never,
	},
	}),
	);

[zwliew]

Fixed in #3492. Thanks for reporting this :D