Do not process undeliverable mentions #5598
Merged
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This is a hotfix for #5535. It skips processing/rendering mentions for remote OStatus users so that at a user knows that something wrong is going on, which is much better than the statu quo (silently dropping messages).
This is still pretty bad design and should be in the long-term replaced by something more informative and more general, such as delivery ack/nack (with some info if possible).
The first commit in this PR is actually #5539, which I hope will be merged soonish :)