Program: 169509
Project: 169509
Buggy source:
/** 
 * Retrieves an item from the specified inventory. This item can be specified.
 * @param tile
 * @param direction
 * @param requestedStack
 * @param useItemCount if true, it'll only retrieve the stack of the exact item count given. it'll look in multiple slots of the inventory. if false, the first matching stack, ignoring item count, will be returned.
 * @param simulate
 * @param fuzzySetting ,
 * @return
 */
public static ItemStack extract(TileEntity tile,ForgeDirection direction,ItemStack requestedStack,boolean useItemCount,boolean simulate,int fuzzySetting){
  if (requestedStack == null)   return requestedStack;
  IInventory inv=getInventoryForTE(tile);
  if (inv != null) {
    int[] accessibleSlots;
    if (inv instanceof ISidedInventory) {
      accessibleSlots=((ISidedInventory)inv).getAccessibleSlotsFromSide(direction.ordinal());
    }
 else {
      accessibleSlots=new int[inv.getSizeInventory()];
      for (int i=0; i < accessibleSlots.length; i++)       accessibleSlots[i]=i;
    }
    int itemsFound=0;
    for (    int slot : accessibleSlots) {
      ItemStack stack=inv.getStackInSlot(slot);
      if (stack != null && WidgetFuzzySetting.areStacksEqual(stack,requestedStack,fuzzySetting) && IOHelper.canExtractItemFromInventory(inv,stack,slot,direction.ordinal())) {
        if (!useItemCount) {
          if (!simulate) {
            inv.setInventorySlotContents(slot,null);
          }
          return stack;
        }
        itemsFound+=stack.stackSize;
      }
    }
    if (itemsFound >= requestedStack.stackSize) {
      ItemStack exportedStack=null;
      int itemsNeeded=requestedStack.stackSize;
      for (      int slot : accessibleSlots) {
        ItemStack stack=inv.getStackInSlot(slot);
        if (stack != null && WidgetFuzzySetting.areStacksEqual(stack,requestedStack,fuzzySetting) && IOHelper.canExtractItemFromInventory(inv,stack,slot,direction.ordinal())) {
          int itemsSubstracted=Math.min(itemsNeeded,stack.stackSize);
          if (itemsSubstracted > 0)           exportedStack=stack;
          itemsNeeded-=itemsSubstracted;
          if (!simulate) {
            stack.stackSize-=itemsSubstracted;
            if (stack.stackSize == 0)             inv.setInventorySlotContents(slot,null);
            tile.markDirty();
          }
        }
      }
      exportedStack=exportedStack.copy();
      exportedStack.stackSize=requestedStack.stackSize;
      return exportedStack;
    }
  }
  return null;
}

Fixed version (ground truth):
/** 
 * Retrieves an item from the specified inventory. This item can be specified.
 * @param tile
 * @param direction
 * @param requestedStack
 * @param useItemCount if true, it'll only retrieve the stack of the exact item count given. it'll look in multiple slots of the inventory. if false, the first matching stack, ignoring item count, will be returned.
 * @param simulate
 * @param fuzzySetting ,
 * @return
 */
public static ItemStack extract(TileEntity tile,ForgeDirection direction,ItemStack requestedStack,boolean useItemCount,boolean simulate,int fuzzySetting){
  if (requestedStack == null)   return requestedStack;
  IInventory inv=getInventoryForTE(tile);
  if (inv != null) {
    int[] accessibleSlots;
    if (inv instanceof ISidedInventory) {
      accessibleSlots=((ISidedInventory)inv).getAccessibleSlotsFromSide(direction.ordinal());
    }
 else {
      accessibleSlots=new int[inv.getSizeInventory()];
      for (int i=0; i < accessibleSlots.length; i++)       accessibleSlots[i]=i;
    }
    int itemsFound=0;
    for (    int slot : accessibleSlots) {
      ItemStack stack=inv.getStackInSlot(slot);
      if (stack != null && ItemStackHelper.areStacksEqual(stack,requestedStack,fuzzySetting) && IOHelper.canExtractItemFromInventory(inv,stack,slot,direction.ordinal())) {
        if (!useItemCount) {
          if (!simulate) {
            inv.setInventorySlotContents(slot,null);
          }
          return stack;
        }
        itemsFound+=stack.stackSize;
      }
    }
    if (itemsFound >= requestedStack.stackSize) {
      ItemStack exportedStack=null;
      int itemsNeeded=requestedStack.stackSize;
      for (      int slot : accessibleSlots) {
        ItemStack stack=inv.getStackInSlot(slot);
        if (stack != null && ItemStackHelper.areStacksEqual(stack,requestedStack,fuzzySetting) && IOHelper.canExtractItemFromInventory(inv,stack,slot,direction.ordinal())) {
          int itemsSubstracted=Math.min(itemsNeeded,stack.stackSize);
          if (itemsSubstracted > 0)           exportedStack=stack;
          itemsNeeded-=itemsSubstracted;
          if (!simulate) {
            stack.stackSize-=itemsSubstracted;
            if (stack.stackSize == 0)             inv.setInventorySlotContents(slot,null);
            tile.markDirty();
          }
        }
      }
      exportedStack=exportedStack.copy();
      exportedStack.stackSize=requestedStack.stackSize;
      return exportedStack;
    }
  }
  return null;
}