I've been trying to figure out how to get a component to only be able to
drag along a horizontal path (so no vertical movement).  The drag event
handlers don't return anything related to the drag image as far as I can
tell (only the dragable component, but that stays where it is.  The jquery
one didn't seem useful in that respect either.  I tried manually doing the
drag using mouse events, but the mouse event record is missing some values
that would be useful to do that (it only provides the screen XY and the XY
relative to the component, but not the other XY options like relative to
the window..

Does anyone have any experience constraining a drag to just being
horizontal.  I want to be able to click into a component and only be able
to drag it left / right.
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