Routines
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CFB8: IY becomes the candidate
Used by the routine at search_chain.
Part of iy_goes_first: adds IY to the chain, makes it the candidate, and compares it with the whole list from the top, since it may not be the first undrawn entry.
Nothing checks the chain's length. candidate_chain has room for seven indices and the terminator; an eighth link would put its $FF terminator over the first byte of check_user_input. How long a chain real rooms can produce has not been measured.
iy_becomes_candidate CFB8 LD A,C append IY's index and a new terminator
CFB9 LD (DE),A
CFBA INC DE
CFBB LD A,$FF
CFBD LD (DE),A
CFBE PUSH IY IX = IY; $5BCD = $5BCF
CFC0 POP IX
CFC2 LD HL,($5BCF)
CFC5 LD ($5BCD),HL
CFC8 LD DE,objects_to_draw compare from the top of the list
CFCB JP compare_next_obj
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