This suggested edit has “added 3408 characters in body”, yet the diff only shows 11 added characters. Why?
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As a <2k user across the network, I think I can shed some light here. When a user goes to re-edit a post on which he has a pending suggested edit, the software automatically fills in the edit summary from the most recent version of the suggested edit. So assuming that the behavior hasn't changed since 2011, a likely explanation is that the user in question did initially propose an edit at 10:04 that added some 3000+ characters, and then, over the subsequent 2-hour period before rejection, modified the suggestion at least once until it became the one-line change we see preserved in the linked review. If the user never bothered to touch the edit summary box throughout the whole process, the automatically-generated summary from the initial proposal would remain – completely untouched – on all subsequent versions of the suggestion despite no longer being an accurate reflection of the content.
Could very well be simply a huge amount of whitespace added.
They don't show up in the diff, but the characters are counted towards that number.
(Random edit to a sandbox post here - shows 186 chars added to body that are not visible in the diff.)