Eliminate shapes that span full width or height of grid #9
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Eliminates shapes that span the full grid height or width. This should help remove shapes that only have a handful of potential positions. (Another option would be to check the width and height of the shape and calculate how many positions it could occupy in the grid. I choose this option instead because it also makes the shape more compact, which increases the puzzle-y aspect of the game.)
See also #8, where I did this as well as increased the grid size for larger shapes. I'm choosing this solution instead because a 5x5 grid felt too hard.