[new_builder] Wild selection on high block foundations

Summary: On at least two block high foundations made by the slab tool, the selection box clips randomly after a wall has been selected.

I have more pictures. I like my pictures.

Steps to reproduce:

  1. A slab foundation is laid and made a voxel higher C2

  2. A random room is built on top of the foundationC4

  3. I randomly want to resize a wall of my random roomC5

  4. I move my mouse off to the side: magicC6

Expected Results: Only the wall stays selected.

Actual Results: Selection clips randomly on and off while on the foundation even after all walls had been deselected.

Attachments: I have save. I like my save. WoodenTemple.rar (3.6 MB)

Version Number and Mods in use: release 815 - no mods

System Information: Win 7; i5-2450M CPU @ 2,50 GHz; RAM 6GB; NVIDIA GT 630M 2GB VRAM