how "overflow-y" indirectly impacts the sizing
     behavior of flex items with "min-width:auto" (the new initial value
     for "min-width"), via its influence on "overflow-x".

     In particular, the flex-item-specific "min-width:auto" behavior is
     supposed to be disabled (e.g. we end up with min-width:0) when
     "overflow-x" is non-"visible".  Moreover, when "overflow-y" is set to a
     scrolling value, it forces "overflow-x" to compute to a scrolling value
     as well, as described at
       ht