The per-image reference/model choice of indexing ignored the crystals' refined cells. On a
pseudo-merohedral cell, where at least 90% of the crystals' cells fit the run's cell better as
indexed than after a twin law, the cells decide that law - the rule the data-only resolution
already uses (AnchorOnCells, factored out of ResolveReindexReferenceFree and shared). The resolver
now keeps each image's CC per indexing (IntegrationOutcome::reference_cc); before the stills
merge, AnchorReferenceReindex puts every image back as indexed, applies the cell rule, and lets
the reference choose only among the indexings left open. Exactly merohedral lattices (no metric
signal) are unaffected.
Still battery (REFMAC 0-cycle R-free, model before -> anchored; data-only in brackets):
pal90 0.1883 -> 0.1834 (0.1832), alvra213 0.2073 -> 0.2011 (0.2013), alvra213_int16
0.2081 -> 0.2021 (0.2024); euxfel83 0.2037, euxfel152 0.2452, sacla237, lcls222 unchanged;
lcls242_t 0.2847 -> 0.2952 (0.2942): there the model had moved about half the crystals against
cells that decide all three laws (96/96/100%).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015CeEGgpKdfkCTJb3YNMJcu
(cherry picked from commit 85c804676ffd15ffd66e2ba05928000d6f4e765f)
leonarski_f
3882b0f062
