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Keep mixed-color filaments intact when the extruder count changes (#15385)

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* Keep mixed-color filaments intact when the extruder count changes

The extruder-count spinner resized the filament arrays in bulk at the tail,
which is where mixed-color slots live, so a new filament landed behind the
mix and the sidebar skipped a slot number. It now adds and removes one slot
at a time through the same calls the sidebar's +/- buttons use, so a new
slot opens ahead of the mixed tail and a removal renumbers object filament
ids, painted facets, custom g-code and mixed components rather than
clamping them away.

Drops the vector overload of set_num_filaments(), which this leaves without
callers.
This commit is contained in:
SoftFever
2026-08-26 19:06:33 +08:00
committed by GitHub
parent 9dc9b42475
commit 5552ed6cf1
6 changed files with 246 additions and 88 deletions
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src/slic3r/GUI/GUI_App.cpp
+10 -4
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@@ -8906,10 +8906,16 @@ void GUI_App::load_current_presets(bool active_preset_combox/*= false*/, bool ch
auto* nozzle_diameter = edited_printer_preset.config.option<ConfigOptionFloats>("nozzle_diameter");
if (nozzle_diameter) {
// Mixed-color slots are virtual filaments kept at the tail of the list, so they have no
// nozzle of their own. Sizing to the nozzle count alone would silently drop the mixes of
// a just-loaded project, and update_extruder_count() would then strip the facets painted
// with them.
preset_bundle->set_num_filaments(nozzle_diameter->values.size() + preset_bundle->num_mixed_filaments());
// nozzle of their own and the count has to allow for them. Only ever grow: this sizes
// the list so the combo boxes have something to bind to, and set_num_filaments() trims
// at the raw tail, so shrinking here would eat the mixes rather than the surplus
// physical slots. A list longer than the nozzle count is a state the app reaches
// legitimately - raising the extruder count and not saving the printer preset leaves
// exactly that on the next start - and losing the project's mixes to it is worse than
// carrying a filament the printer has no nozzle for until the count is next changed.
const size_t target = nozzle_diameter->values.size() + preset_bundle->num_mixed_filaments();
if (target > preset_bundle->filament_presets.size())
preset_bundle->set_num_filaments(target);
}
}
this->plater()->set_printer_technology(printer_technology);