Ability to Mark a Conversation UnRead at any time

I really like the new feature to "mark unread" on a conversation, but sometimes i am distracted or someone interupts me while i am reading something and when i get back to it i know longer have the ability to mark it as "unread". I don't know what the trigger for the option to mark unread to go away, but it would be good to have the ability to go back at any time and mark it unread. 


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