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flip: Set a lower bound on the size of little diagrams

This ensures that they don't vanish entirely and small tile sizes.

--- a/flip.c

+++ b/flip.c

@@ -1159,7 +1159,7 @@

 	for (j = 0; j < w; j++)

 	    if (state->matrix->matrix[(y*w+x)*wh + i*w+j]) {

 		int ox = j - x, oy = i - y;

-		int td = TILE_SIZE / 16;

+		int td = TILE_SIZE / 16 ? TILE_SIZE / 16 : 1;

 		int cx = (bx + TILE_SIZE/2) + (2 * ox - 1) * td;

 		int cy = (by + TILE_SIZE/2) + (2 * oy - 1) * td;

 		if (ox == 0 && oy == 0)

-- 

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