Nextcloud Office: Web browser's back arrow doesn't work, blank screen

[pedropintosilva]

Describe the bug

reported by Julie

When I click on the web browser's arrow to go back one step (i.e. out of the spreadsheet and back to the original folder I entered) it doesn't always respond and I have to repeat the action another 1 or 2 times before I can "escape" the spreadsheet.

To Reproduce
Steps to reproduce the behavior:

1. Open a spreadsheet
2. Click the web browser's back button
3. Sometimes nothing happens, just a blank screen
4. I need to click multiple times (URL in the address bar changes but nothing happens) until I'm back to NC BUT not the place I was expecting to: Dashboard

Additional notes from Pedro: it seems the document is correctly closed, but the user gets stuck in a blank screen:

Expected behavior
Click arrow to go back should get me back to the previous screen that I was in before opening the spreadsheet.

Screenshots
If applicable, add screenshots to help explain your problem.

Client details:

• Firefox, desktop

Server details

• Nextcloud
  • This Nextcloud is on version 27.0.2 Enterprise
  • OC.getCapabilities().richdocuments.version
    • 10:18:03.123 "8.2.0"
• Collabora Online
  • COOLWSD version: 23.05.4.1snapshot (git hash: d39d2cd (E))
  • LOKit version: Collabora Office 23.05.4.20230917 (git hash: 34a9524)
  • Served by: Debian GNU/Linux 12 (bookworm)
  • Server ID: 5da3ee77

[juliusknorr]

Needs some double checking if this has already been fixed with the files2vue migration for 28 as the browser history handling has changed there iirc.

[juliusknorr]

I'm unsure what has changed the behaviour there but the back operation only happens in the iframe, no close post message is emitted.

Not sure if we can listen for https://developer.mozilla.org/en-US/docs/Web/API/Window/popstate_event on the iframe to handle it accordingly