Office online does not respect a local locked file by user. about officeonline HOT 2 CLOSED

Tested on both Firefox and Chrome:

1. User A: Create a new Word file online/locally ( tested online)
2. User A: Write something in that file from the online editor and close it
3. User A: Share the file with User B
4. User A: Open it locally
5. User B: Hit F5 online and notice it's locked by User A
6. User A: Write something in your local document and hit save
7. User A: Notice that the file is now saved locally and synced to Nextcloud (keep the document open locally)
8. User B: Open it online and write something
9. User B: Can edit the file, and the changes are saved
10. User A: still has the document open locally, but now the desktop sync client gets errors regarding that the file can't be synced
11. User B: Closes the document
12. User A: Closes local edit and opens the document - the changes that User B made are present
    12.5. Even if User B would close and open the document while it's open locally by User A - the changes would still be present.

from officeonline.

I've pushed a fix to #442 but could only partly validate it due to issues with my OSS setup as outlined in the PR. Any help in testing is very welcome.

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