I cannot see it in topics...
It is hidden the group onGroup list & also Private.
Btw this is on my NodeBB
NodeBB core doesn't have anything to prevent this. But plugins can be made to prevent multiple accounts from the same IP etc although it can be easily by passed.
@arasbm For a 100 posts you can simply use the google groups' rss feed. Here's a post on stackexchange that explains how.
Unfortunately I could not find a way to page the feed so if you have more than a 100 posts this probably wont work.
@baris Thank you!
I've been able to reproduce this. Working on finding the bug right now.
The easiest way is to use git to apply the same changes to the new files.
You can create a patch and then apply that patch to an upgraded clone of the repository. Git will tell you when conflicts occur and you can fix those manually.
Do note this is exactly why we recommend using a plugin for customization: it's much easier to keep plugins up to date than modify your customizations to core every time we modify the file.