When I hover over the message of another user, I get the 3 options pictured below. The right-most of these options will make my next message a reply to the selected message:

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If I decide to edit the message, the reply action will be gone from the options afterwards:

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  • This is another side effect of the above mentioned question. – ɥʇǝS Apr 29 '13 at 17:11

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