go-int found both by reading the kit before importing it. Both are in landed code
and both reach Big Picture in Arabic, not only a new consumer.
THE DRAG HAD NO READING DIRECTION. facetW and railW were computed from
(clientX - startX), written once, in LTR. Under dir=rtl the grid mirrors — the
facet rail sits on the RIGHT — so dragging its handle toward the map moves clientX
the other way, and in Arabic the facet handle shrank the CHARTS rail. Both handles
fight and neither does what the cursor says. The delta now carries a sign read from
the computed direction per drag, not cached: a host can flip dir between gestures,
because our own composites set it on the custom-element host from the runtime
locale.
The ARROW KEYS take the same sign. If only the pointer mirrored, the two input
methods would disagree about which way widens — and aria-valuenow reports the same
ref for both, so the announced value would move opposite to the key for someone
who cannot see the drag.
AND THE LEGACY READ-THROUGH WAS MINE, FROM KIT LANDING 2. I added it so
namespacing would not discard a reader's saved layout, and applied it
unconditionally. So a caller passing its OWN storageKey — which is the entire point
of namespacing — still inherited Big Picture's rail widths on first load. The
migration written to protect one dashboard's layout was handing that layout to
every other dashboard. It is gated on the default key now, and the default is a
named constant rather than a repeated literal, because a fallback comparing against
a copy of its own default stops matching the day someone bumps the version suffix.
check:layout-key-namespaced grows arms D and E. D asserts BOTH widths take the sign
and that the arrows share it — mirroring one and not the other is worse than
mirroring neither, because then the handles disagree with each other. E asserts the
legacy read is gated. Comments are stripped before both assertions, for the reason
that is now written down four times over.
Source only. STUDIO: needs a rebuild of research-dashboard and dashboard-plus-grid.
NEEDS EYES: the drag is a gesture, so this wants rega in ar — drag the facet handle
toward the map and confirm the FACET rail follows the cursor and the charts rail
does not move, then the same with ArrowLeft/ArrowRight.
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