Credited to design-dev. His R2 order check has a positive control — one tile
given order:-1 that the check must catch — and the control went blind when group
headers became grid children: nth-child(5) started landing on a header rather
than the fifth tile.
Same class as the two defects already in this file. A control that no longer
controls reads exactly like a passing test; nothing in the output distinguishes
'detected nothing because there was nothing' from 'detected nothing because I am
aimed at the wrong element'.
The rule: nth-of-type over nth-child wherever the assertion means the Nth TILE
rather than the Nth child element. They agree until somebody adds a sibling of a
different kind, and adding siblings is what a redesign is.
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