The census bounded WHERE a wrong tie-break could show and said outright that
nobody had measured how many of those pairs change a pixel. Measured.
`compose_with_order` renders a bundle in a caller-supplied order; the new
example renders each screen twice, once derived and once with one tied pair
swapped, and diffs. Same-key elements are contiguous under a stable sort on
(key, i), so a swap paints nothing else in between.
Controlled per entry: swapping an OVERLAPPING pair with DIFFERENT keys moves
36 305 to 771 479 px (max delta 254). Where no such pair is drawn the output
says so rather than reporting an uninterpretable zero.
* EXTRAS (entries 6/9) and the main menu (5/8): 0 px. The tied ptframe pairs
ink ~3 600 px each and share NONE of them -- the 102x132 rect overlap was an
artefact of approximating an element as pivot x 2. Blend-independent.
* Across all 31 drawable overlapping tied pairs in GP_TITLE, the largest change
any of them makes to any channel is 3/255.
* Withdrawn: "a wrong tie-break can be wrong by a whole layer". That rested on
ptlogo_back2eff5 geometrically containing two other glows. Rendered, the swap
moves 6 390 px by max delta 2. Containment is not occlusion when the container
is a near-transparent glow, and nobody had rendered it before asserting it.
Reach: this measures our compositor's sensitivity to order, not the game's. The
zero-shared-ink results hold under any per-pixel blend; the delta<=3 figures
assume ours.
13 disc-gated ui_paint_order_disc tests and 114 lib tests pass unchanged.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QsEPXWVaEpyfudtR6re1Pd
884822ebe3