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The beginning of post is truncated by the excerpt and the end has an ellipsis. I don't think the beginning should be cut off at all, and if it has to be at least preface it with an ellipsis as well. An excerpt size parameter would be useful.
I have had a quick look at the code for this part of the forum macro. We are actually using the getExcerpt method from the object in question (page or comment) to generate the excerpt which is doing the cutting off. I guess we could look at implementing our own version of this in the future.
Some workarounds for now: