I found this topic "heidisql com thread 21382" which discusses about a bug with a mouse with a possibility to scroll sideways with the scroll. It's stated there that one could use horizontal scroll in query editor / area, but with touchpad and two fingers that's not possible even there. The vertical scroll works perfectly in every view where there is something to scroll, but I haven't been able to scroll horizontally in any view.
Unable to scroll horizontally with touchpad
The thread you mentioned is about scrolling via mouse with a horizontal scroll wheel. You say your touchpad does not work here. That could be the same cause, not sure. Is there an issue report about that in the tracker already?
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