Keying the ring off the fill singled out the light colors: on the map the
orange network-device marker took a black ring while its neighbours kept white
ones, and the legend dot for the same type wore a surface-colored border, so
the key did not match the markers.
Ring by the SURFACE instead - dark on the white blueprint, light on the dark
one - which is uniform within a theme and still works for every fill, since a
fill that resembles the ring is by definition far from the background. Legend
swatches take the same ring, the theme watcher redraws the markers (their ring
now depends on it), and the PDF uses the light-surface ring throughout because
it prints on white.
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