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drlg_l1: add BUGFIX for DRLG_L5 #2285

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Commits on Dec 15, 2022

  1. drlg_l1: add BUGFIX for DRLG_L5

    When generating dlvl=2 dungeons containing a
    staircase down to the Poisoned Water Supply,
    a check is missing to ensure that doneflag
    is not set to FALSE by the first call to
    DRLG_PlaceMiniSet(PWATERIN, ...).
    
    If that was the case, then a second call to
    DRLG_PlaceMiniSet may be made, to place
    L5STAIRSUP even though doneflag may have been
    set to FALSE.
    
    For the correct logic, cross reference against
    the drlg_l2 code for placing staircases using
    DRLG_L2PlaceMiniSet.
    
    For a PoC triggering the incorrect behaviour,
    see dlvl=2, seed=0x0000007B with
    quest=Poisoned Water Supply active.
    mewmew committed Dec 15, 2022
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