The panel has no alpha and there is no framebuffer to blend against -- 307KB against
276KB free -- so a scrim cannot be composited. It can be computed instead: the palette
is re-derived from seeds mixed toward black, and the content behind a dialog is
repainted in those colors, which is the result a black scrim would have produced. The
tree was already the source of truth, so dimming is a palette swap rather than a
readback. A node marked dimmed carries it to everything it contains, and ui.confirm
opts its card back out.
Doing that exposed a latent bug in bordered boxes. They filled a square rect and then
drew a rounded border over it, so the corners the border does not cover showed the
fill. That was invisible while everything behind a card was the same color as the card,
and obvious the moment the background dimmed. Separating the two roles fixes it: bg is
what a node fills, surface is what sits underneath, anti-aliased edges blend into
surface, and a box that paints its own rounded background suppresses the square fill.
evan
e530331613