React-Grid-Layout v1.5.1 Demo 13 - Error Case

This is an extra test case for a collision bug fixed in November 2017. When you drag 1 over 2, it should not move over 3.

Displayed as [x, y, w, h]:
1: [0, 0, 1, 1]
2: [1, 0, 1, 1]
3: [0, 1, 2, 2]
1
2
3