If my Emacs window is above the top of my screen (which is how I usually have
it since I don't care about the title bar, etc.), I cannot drag a file onto
the top part of the Emacs window/frame. If I try to, I get this error:
Not an in-range integer, float, or cons of integers
I traced the problem to the "XdndPosition" cond in x-dnd-handle-xdnd, which
calls x-send-client-message. The "list-to-send" variable has a negative y
value, which it gets from x-dnd-get-drop-x-y. I think the way to fix this is
to change x-send-client-message so it accepts negative x/y values, but I'm not
sure if that's correct.