The Driver settled the call this was parked on: "the only changes are to the map to
make it look better, and to add the all-regions map ... which needs to be
intuitive". This is the map half, on the sanctioned addition only.
Their .country-map flips to aspect-ratio 1/2 under 768px and we port that verbatim
on .rcm — right for the CLONE pages, which frame one region or country in portrait.
The chooser renders under the GLOBE projection, so its subject is a CIRCLE whose
diameter cannot exceed the frame's short side. In a 1:2 frame that circle covers at
most W / 2W = 50% of the height: at 390px wide, 390px of globe in a 780px box with
the rest empty.
So this is geometry, not a preference between two acceptable options. A square is
the ONLY frame a circle fills on both axes, and every other ratio is provably worse
for a circle:
1/2 frame height 50% area 39.3%
1/1 frame height 100% area 78.5% (pi/4, the maximum in any rectangle)
Vertical coverage doubles.
SCOPED TO THE ADDITION, and that is the part worth checking rather than trusting.
The rule is .rcm--chooser, bound to colorMode === 'region'. I verified that value
is chooser-only instead of assuming it: mapColorMode returns 'in-country' for a
country and 'prayer' for a region, so 'region' is only the fall-through — the
no-selection state. If that ever stopped being true, this rule would silently
change cloned geometry, which is exactly what the scope ruling forbids, so the
check asserts it.
The existing globe-fill formula needs no change: it bisects the zoom that fills the
frame's SHORT side, which a square leaves well defined.
_chk-chooser-square-on-mobile-clone-untouched.mjs asserts both halves — the chooser
changed AND the clone did not — computes the coverage rather than restating it, and
carries a NEG control showing a 1/3 frame scores worse than 1/2, so the metric
discriminates between ratios instead of blessing whatever it is given.
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