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Three of the four IMEX physical-vs-logical fixes landed earlier on this
branch (fbc58d2a1d, fa048babeb, a38b95bf45, e11e7d46df) used inline
lambdas / direct loops to translate physical extruder indices to logical
filament slots. No test coverage existed for the specific composition,
even though the underlying primitives (resolve_filament_for_head,
first_filament_for_physical_head) were tested.
Pull two patterns out of Plater.cpp and GCode.cpp into IMEXHelpers as
named helpers, then unit-test them:
imex_primary_logical_from_objects(used_slots_1b, pem, primary_physical)
Walks the plate's used filament slots (1-based) and returns the
first one whose pem entry maps to the primary's physical extruder.
This is what the warning's `logical_for_primary` now delegates to —
moves the "look at object assignments, not pem first-routed default"
behavior introduced in fa048babeb out of the lambda and into a
separately-testable function.
imex_secondary_logical_slots(active_physicals, primary_physical,
plate_head_filament_map, pem)
Iterates IMEX active physicals, skips the one matching primary,
resolves each remainder via resolve_filament_for_head (per-plate
override + first-routed fallback), deduplicates, drops -1 entries.
Replaces the inline loop in GCode::_do_export's is_extruder_used
marking (a38b95bf45 + e11e7d46df).
10 new test cases in test_imex_helpers.cpp cover the cases that
correspond directly to bugs hit:
imex_primary_logical_from_objects:
- AFC primary picks the object's slot (the user's specific bug)
- Multi-color AFC primary returns first input-order match
- Direct extruder primary unambiguous (no MMU)
- No object routed to primary returns -1
- Empty inputs (no objects, empty pem)
imex_secondary_logical_slots:
- Copy mode skips primary, falls back to first-routed
- IQEX 4-mode enumerates all three secondaries
- Per-plate override wins over first-routed
- Drops unrouted physicals + deduplicates
- Only-primary-active returns empty
All [IMEX] + [Variant] + [3mf] regression: 166 assertions / 61 cases.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>