It's been discussed several times internally, but for the moment we don't see a way to ensure such a list would remain up to date at a reasonable expense in manpower/time.
A flag on posts (reported as bug**=not relevant/ yes),
an instruction that if you have the same problem it is better to go and agree on post with same issue than open a new one
and a more interactive search feature*, would help though.
Right now there is a feeling that the more the merrier in bug posts. Personally I have a dislike in using forums for bug user-submissions due to the inability of consolidating user-submissions, not having a centralized location for end-user bug report and having to either build automations to transfer bug-data or do a lot of manual re-entry, but that's me and a entirely different discussion.
*ie. for empire x war declarations on myself, i easily found a lot of posts and i refrained for making a new one, for password in cleartext i didn't but you said it had already been reported which I believe it, but couldn't find it.
** reported as bug - means nothing other than "we know about it"
@Kliwarrior There is no easy way of conveying this type of information back from whatever bug-tracking service/ database/ ... , to a forum unless you invest in building an intermediate API or static interface between the two and/ or allocate someone to handle this manually and here comes the difficult part. The person that identifies, researches and/or accepts bugs is usually someone that has a more advanced skillset than your average forum mod (no pun intended), so having a skilled tester, spend much of his time on a tool that is not really applicable for this type of information (and VERY inefficient in tracking or consolidating this type of information) would result in a list that may be : A) incomplete, B) untimely updated, C) not easy to read .
I would love to be able to see a comprehensive list but I would be happy just being able to find if something is a bug or not, so as to keep the flow controllable and the whole task cost effective, enough to be able to nag about my X/Y weird bug not getting fixed and not feel bad about it.