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3b445905d1
flush_volumes_matrix stores one (filaments x filaments) block per nozzle, but set_extruder, WipeTower2::extract_wipe_volumes and the PresetBundle rebuild indexed each block with filament_colour.size() as the row stride. When the stored matrix does not match that assumption (a legacy project, or a just-switched printer -- e.g. a single 2x2 block while nozzle_diameter has 2 entries) the index runs past the sliced block and reads out of bounds. The read is undefined, so its value depends on the C++ std-lib/allocator layout: identical across Linux architectures but different on macOS/Windows. That surfaced as the "Toolchange temperature commands are unchanged when the wipe tower wait is off" regression failing on Linux CI while passing on macOS/Windows, and crashing hardened (-O0, _GLIBCXX_ASSERTIONS) builds. - Centralize the block-dimension derivation in get_flush_volumes_matrix_dims (sqrt(size / nozzles) with a filaments^2 * nozzles == size check and a single-block fallback) and use it wherever the matrix is sliced/indexed; bounds-guard the reads as defense in depth. It weighs both options that claim to say how many blocks are stored, since either can be stale: flush_multiplier, written with the matrix in the project config, and nozzle_diameter, which changes the moment a printer is selected. - PresetBundle::update_multi_material_filament_presets: rebuild the matrix on a nozzle-count-only change too (the old per-block gate missed those), and seed a brand-new nozzle from the first nozzle's tuned block. - is_flush_config_modified: stride the stored matrix by its own dimension rather than the current filament count, and bound the nozzle loop by the printer's extruder count, which CalcFlushingVolumes indexes as well. - is_flushing_matrix_error: the same derivation, which additionally divided by zero on an empty flush_multiplier. - update_slice_warnings: guard nozzle_hrc_lists, which is sized by the nullable nozzle_type option and can be shorter than the extruder count. With the read fixed the emitted trace is deterministic across builds and platforms, so regenerate the golden from it and stop comparing the rounded "time: <n>s" preheat comment (the tolerant lead time already carries that timing). Add unit tests for the flush-matrix rebuild and dimension logic.
OrcaSlicer tests
Building, running and writing tests is documented on the wiki, under How to Test.
Two files here rather than there, because coding agents only read what is in the repository: