When reading a forum thread and using the instant reply function (i.e. the reply box at the bottom of the thread, not the dedicated reply page by pressing the Add Reply link) and previewing the reply afterwards, all sentences longer than the normal message width (such as this one) are not broken to the next line but overflow (and are hidden).
This is not the case for previews shown on the dedicated Add Reply page.
This condition can be recreated by opening a random forum thread, writing a very long sentence into the quick reply box at the bottom, and clicking on Preview.
My guess is that the .message div has an absolute width which the .post-reply div overrides (or declares overflow: hidden) and thus breaks the post reply preview out of the normal message box textflow. Which prevents it from breaking longer sentences.
Unrelated: you created a gorgeous visual experience for the whole gw2 webpage guys. It’s really a pleasure to use the page.
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