Moving frames does not work correctly.

[JacobAsmuth]

Attempting to hold E and drag/move a frame does not work correctly. Upon trying to move a created frame to the left, or up, relative to the plane it was placed on, the direction reverses and the frame starts to move right or down respectively.

Steps to reproduce:

1. Make a frame, I simply created the a plain DFrame with size 250, 150, and a postion of (0,0)
2. hold E on the corner of the frame and try to move it to the left or up
3. See that it doesn't work.

[handsomematt]

No idea how to fix this, pretty sure it's to do with how DFrame handles it's dragging (not very well), getting this to work would require a lot more hacks then worth.

[MattJeanes]

This is partially fixed by 1b52ea2 - it shouldn't reverse direction anymore when going up or left but it might just refuse to move at all.