We get a few bugs where things have become inconsistent between message list and message preview. You need to know that the message list is populated from a database, but when viewing the message we read the message itself. If the database got out of step with the message storage, we get these inconsistencies. So the database needs to be rebuild, and that's what "repair folder" does. If you find a reproducible case, we're happy to investigate, but for now, let's close this bug. I'll make it "incomplete" since we don't know how it happened.
Bug 1606914 Comment 4 Edit History
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We get a few bugs where things have become inconsistent between message list and message preview. You need to know that the message list is populated from a database, but when viewing the message we read the message itself. If the database got out of step with the message storage, we get these inconsistencies. So the database needs to be rebuilt, and that's what "repair folder" does. If you find a reproducible case, we're happy to investigate, but for now, let's close this bug. I'll make it "incomplete" since we don't know how it happened.