Note to self: the "Hide all posts from blogs I've blocked" tweak currently hides posts unconditionally when they're viewed by themselves if they have a blocked blog in the trail, something which this PR (iirc) carefully avoids; consider making these consistent.

I think we should never be outright hiding posts if we're on their permalink page; maybe we should have a "hide this post" util which checks for that and inserts a signpost in the permalink case. (No plans to do this myself, please implement this if you want to.)

Originally posted by @AprilSylph in #677 (comment)