Comment 7 for bug 1840154

@Jeff, this only happens when warping to the reference point. The position stored in the LIB_ITEM isn't actually the position it is at on the screen, instead it is stored with the Y-axis inverted since that is how the library stores it. Everywhere else that interfaces with the position inverts the Y-axis before use.

The attached patch should fix this (and also some formatting issues).