option to fill 1x1 spaces earlier

[bobderbobs]

example: with the sequence of blocks 2x2, 1x1, 3x3 there is a gap above the 1x1 block created where only another 1x1 block can fit in. i think it would be nice to have the option that this would fill earier as it lowers also the chance that a 1x1 block needs to fall through another block.

[mononaut]

that's an interesting idea, thanks!

avoiding cases where blocks need to pass through each other would definitely make the visualization more satisfying.

It's probably a bit too obscure for a user-configured setting, but I'm open to tweaking the default layout algorithm if this approach looks better.