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Tags used on private pages are leaked in tag search and tag completion

Using a tag on a post will index it for global tag search and for tag completion, visible to any user. It seems that this applies even to posts on private pages.* Since tags can be arbitrarily long and may be used for tumblr-style commentary, this has the unwanted side-effect of leaking potentially private information in full sentences to any user, simply by chance of them typing a tag into the post compose box that has the same prefix.

*I briefly checked whether un-/following the private page affects this. After I unfollowed the private page, the unique tag was still listed for tag completion in the post compose box, so I assume this behavior is global.

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