User receives a notification about his post being moved to/within an inaccessible forum that leaks the thread title

[XFFA.IR Bot]

How to reproduce:

1. Move a thread that Alice participated in to a forum that Alice has no access to. (Or revoke Alice's access to a forum she previously posted in.)
2. In this thread, move one of the posts by Alice to a new thread (within the same forum that Alice has no access to). Don't manually uncheck "Notify author of this action".

This results in a notification for Alice with a broken link to the inaccessible thread. But more importantly the notification leaks the title of...

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