BLOCK_CHANGED_IN_SUB
gBlocks[0].current |= BLOCK_CHANGED_IN_SUB;
or_block(block, BLOCK_CHANGED_IN_SUB);
or_block(block, BLOCK_CHANGED_IN_SUB);
gBlocks[0].current = BLOCK_CHANGED_IN_SUB;
gBlocks[0].current &= ~BLOCK_CHANGED_IN_SUB;