(Posted by Lummox JR on behalf of Mystery16.)

Descriptive Problem Summary:

Changing a movable's bounds so that they're outside of the map will allow movement beyond the map by allowing step_x/y to exceed normal values.

Numbered Steps to Reproduce Problem:

1) Move a mob to locate(1,1,1).
2) Set the mob's bound_x to -1.
3) Move west.

Expected Results:

The mob should be stopped at the map border.

Actual Results:

The mob keeps moving past the border.