Diagonal resizing is broken

[maltenuhn]

Describe the bug
A manually inserted div or span cannot be resized diagonally.

To Reproduce

1. In code, add a div (or View) into the main view, and fill it withhello world, so that the result is <span>Hello World</span>
2. Try to resize it diagonally

Result: 9 block shows, but can't resize diagonally
Expected: either 9-block doesn't show (bleurgh) or we can actually resize

[Rheeseyb]

Crap... I think there's a good chance I broke this with my work around only setting pins that had changed (#32)

[enidemi]

i think i broke it last week when changing resize to drag from edge only adds the horizontal/vertical prop changed by dragging