Card Deck - Flexbox: Set images per card-deck row. (Good in A5. Broken in A6)

Created by: kwhdever

Sample code using A5 and A6 links below. Same code, just A5 vs. A6.

Previously able to have exact control over the number of cards in a card-deck row: Either 4-up or 2-up or 1-up.

A vital feature to facilitate precise design layout across viewport sizes. (Rather than whatever card-deck default generates)

To see issue: Open HTML files in Chrome and narrow the window size to see the effect. (Links below)

Bootstrap 4 - Alpha 5 version (Works good)

Bootstrap 4 - Alpha 6 version (Broken. Identical code except using A6)

Thank You Keith Howard