[css-grid] auto-placement algorithm step 2 doesnt' respect sparse/dense/stack choice

In another thread, Manuel Casasnovas points out that step 2 of the
auto-placement algorithm (which processes items with a definite row
position but auto column position) doesn't vary its behavior based on
the algorithm specified in 'grid-auto-flow'.  Interestingly, it
actually does a "dense" packing, as it repeatedly looks for the
"earliest" spot in the row that the item will fit in.  (This makes
sense, as it's the easiest way to implement it; doing a sparse packing
would require more work, and wouldn't even maintain the ordering that
is the entire justification for sparse packing.)

Should we have this step pay attention to the algorithm, or leave it
as it is?  I'm inclined to leave it as it is.

~TJ

Received on Tuesday, 16 September 2014 17:45:34 UTC