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Fix user preset load crash from inconsistent per-variant vector sizes (#14106)

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* Fix user preset load crash from inconsistent per-variant vector sizes
This commit is contained in:
SoftFever
2026-06-08 22:13:00 +08:00
committed by GitHub
parent bd41eebba9
commit f3a5c169c9
2 changed files with 61 additions and 1 deletions
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14
src/libslic3r/PrintConfig.cpp
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@@ -10256,7 +10256,19 @@ void DynamicPrintConfig::update_diff_values_to_child_config(DynamicPrintConfig&
int stride = 1;
if (key_set2.find(opt) != key_set2.end())
stride = 2;
opt_vec_src->set_only_diff(opt_vec_dest, variant_index, stride);
// set_only_diff() requires the base vector length to equal variant_index.size()*stride, where
// variant_index is sized from the parent's printer_extruder_variant list (or 1 when it has none).
// Legacy / multi-extruder / multi-variant presets can violate this in either direction when a key's
// stored length and the variant-list length were sized inconsistently - e.g. a Snapmaker U1 base
// (4 nozzles) whose stride-2 machine limits were length-extended to nozzles*2 while its
// printer_extruder_variant list is empty (variant_index == 1), so base length != variant_index*stride.
// Rather than throw (which is caught upstream and DELETES the user preset file), fall back to the
// child's explicit value, which is authoritative for its own extruder/variant layout.
if (opt_vec_src->size() != variant_index.size() * size_t(stride)) {
opt_src->set(opt_target);
}
else
opt_vec_src->set_only_diff(opt_vec_dest, variant_index, stride);
}
}
}