only "publish to followers" when things really change - fixes #733

What does this PR do?

This is not very pretty, but it seems to work correctly.

My initial idea was to render the user both before and after applying the changes, and compare the renderings, but that adds quite a few DB queries (renderPerson fetches images and emoji) and I felt the not-even-that-simpler code was not worth the added cost.

Better ideas welcome!

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requested review from @fEmber, @puppygirlhornypost, @julia, and @Marie

resolved all threads

approved this merge request

approved this merge request

mentioned in commit 3164e7b4

merged