ZC Fix L3/L4 Potion Stacking

const int I_POTION3 = 0;
const int I_POTION4 = 0;

//Pickup Script for potion stacking. Might not work in standard shoppes.
//D0: Level of this potion.

item script PotionStackingFix{
    void run(int potionLevel){
        if ( !potionLevel) potionLevel = 1;
        if ( Link->Item[I_POTION4] ) Quit();
        if ( !Link->Item[I_POTION4] && Link->Item[I_POTION3] ) {
            Link->Item[I_POTION1] = true;
            Link->Item[I_POTION2] = true;
            Link->Item[I_POTION3] = true;
            Link->Item[I_POTION4] = true;
        }
        if ( !Link->Item[I_POTION4] && !Link->Item[I_POTION3] && Link->Item[I_POTION2] ) {
            if ( potionLevel == 1 ) {
                Link->Item[I_POTION1] = true;
                Link->Item[I_POTION2] = true;
                Link->Item[I_POTION3] = true;
            }
            if ( potionLevel > 1 ) {
                Link->Item[I_POTION1] = true;
                Link->Item[I_POTION2] = true;
                Link->Item[I_POTION3] = true;
                Link->Item[I_POTION4] = true;
            }
        }
        if ( !Link->Item[I_POTION4] && !Link->Item[I_POTION3] && !Link->Item[I_POTION2] ) {


            if ( potionLevel == 1 ) {
                if ( !Link->Item[I_POTION1] ) Link->Item[I_POTION1] = true;
                else Link->Item[I_POTION2] = true;
            }
            if ( potionLevel == 2 ) {
                if ( !Link->Item[I_POTION1] ) {
                    Link->Item[I_POTION1] = true;
                    Link->Item[I_POTION2] = true;
                }
                else {
                    Link->Item[I_POTION2] = true;
                    Link->Item[I_POTION3] = true;
                }
            }
            if ( potionLevel == 3 ) {
                if ( !Link->Item[I_POTION1] ) {
                    Link->Item[I_POTION1] = true;
                    Link->Item[I_POTION2] = true;
                    Link->Item[I_POTION3] = true;
                }
                else {
                    Link->Item[I_POTION2] = true;
                    Link->Item[I_POTION3] = true;
                    Link->Item[I_POTION4] = true;
                }
            }
            if ( potionlevel == 4 ) {
                    Link->Item[I_POTION1] = true;
                    Link->Item[I_POTION2] = true;
                    Link->Item[I_POTION3] = true;
                    Link->Item[I_POTION4] = true;
            }
        }
    }
}