Fixed black rects for extruder colors, when we load 3mf project with MM-printer profile and extruder colors is set to the filament colors

+ Fixed a bug with updating colors in extruder editors in ObjectList, when we use filaments colors for extruders and some filament profile is switched

src/slic3r/GUI/Plater.cpp

@@ -2384,6 +2384,10 @@ std::vector<size_t> Plater::priv::load_files(const std::vector<fs::path>& input_
                             CustomGCode::update_custom_gcode_per_print_z_from_config(model.custom_gcode_per_print_z, &wxGetApp().preset_bundle->project_config);
                         // For exporting from the amf/3mf we shouldn't check printer_presets for the containing information about "Print Host upload"
                         wxGetApp().load_current_presets(false);
+                        // Update filament colors for the MM-printer profile in the full config 
+                        // to avoid black (default) colors for Extruders in the ObjectList, 
+                        // when for extruder colors are used filament colors
+                        q->update_filament_colors_in_full_config();
                         is_project_file = true;
                     }
                     wxGetApp().app_config->update_config_dir(path.parent_path().string());
@@ -5786,6 +5790,26 @@ void Plater::on_extruders_change(size_t num_extruders)
     sidebar().scrolled_panel()->Refresh();
 }
 
+bool Plater::update_filament_colors_in_full_config()
+{
+    // There is a case, when we use filament_color instead of extruder_color (when extruder_color == "").
+    // Thus plater config option "filament_colour" should be filled with filament_presets values.
+    // Otherwise, on 3dScene will be used last edited filament color for all volumes with extruder_color == "".
+    const std::vector<std::string> filament_presets = wxGetApp().preset_bundle->filament_presets;
+    if (filament_presets.size() == 1 || !p->config->has("filament_colour"))
+        return false;
+
+    const PresetCollection& filaments = wxGetApp().preset_bundle->filaments;
+    std::vector<std::string> filament_colors;
+    filament_colors.reserve(filament_presets.size());
+
+    for (const std::string& filament_preset : filament_presets)
+        filament_colors.push_back(filaments.find_preset(filament_preset, true)->config.opt_string("filament_colour", (unsigned)0));
+
+    p->config->option<ConfigOptionStrings>("filament_colour")->values = filament_colors;
+    return true;
+}
+
 void Plater::on_config_change(const DynamicPrintConfig &config)
 {
     bool update_scheduled = false;
@@ -5795,22 +5819,7 @@ void Plater::on_config_change(const DynamicPrintConfig &config)
         {
             update_scheduled = true; // update should be scheduled (for update 3DScene) #2738
 
-            /* There is a case, when we use filament_color instead of extruder_color (when extruder_color == "").
+            if (update_filament_colors_in_full_config()) {
-             * Thus plater config option "filament_colour" should be filled with filament_presets values.
-             * Otherwise, on 3dScene will be used last edited filament color for all volumes with extruder_color == "".
-             */
-            const std::vector<std::string> filament_presets = wxGetApp().preset_bundle->filament_presets;
-            if (filament_presets.size() > 1 &&
-                p->config->option<ConfigOptionStrings>(opt_key)->values.size() != config.option<ConfigOptionStrings>(opt_key)->values.size())
-            {
-                const PresetCollection& filaments = wxGetApp().preset_bundle->filaments;
-                std::vector<std::string> filament_colors;
-                filament_colors.reserve(filament_presets.size());
-
-                for (const std::string& filament_preset : filament_presets)
-                    filament_colors.push_back(filaments.find_preset(filament_preset, true)->config.opt_string("filament_colour", (unsigned)0));
-
-                p->config->option<ConfigOptionStrings>(opt_key)->values = filament_colors;
                 p->sidebar->obj_list()->update_extruder_colors();
                 continue;
             }

src/slic3r/GUI/Plater.hpp

@@ -233,6 +233,7 @@ public:
     void leave_gizmos_stack();
 
     void on_extruders_change(size_t extruders_count);
+    bool update_filament_colors_in_full_config();
     void on_config_change(const DynamicPrintConfig &config);
     void force_filament_colors_update();
     void force_print_bed_update();