The scroll-to-end button in the channel conversation window looks like a draggable piece, but it isn't. This UI is actually good, but it's confusing in this respect. Adding a glyph that looks something like this would improve matters:

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I think shortening that button a tiny bit would make it look more like a button and less like a draggable piece, but it may be clear enough once the glyph is there.

Added. Will be in next release.