Added function to update of custom_gcode_per_print_z in Model from configuration

considering "colorprint_heights" option.

Changed thumb_up/down icons to better preview (feedback from #3256)

Commented some uncertain code

src/libslic3r/GCode.cpp

@@ -1124,9 +1124,11 @@ void GCode::_do_export(Print& print, FILE* file)
     }
     print.throw_if_canceled();
 
+// #ys_FIXME_no_exported_codes
+    /*
     /* To avoid change filament for non-used extruder for Multi-material,
      * check model->custom_gcode_per_print_z using tool_ordering values
-     * */
+     * /
     if (!m_custom_gcode_per_print_z. empty())
     {
         bool delete_executed = false;
@@ -1155,7 +1157,7 @@ void GCode::_do_export(Print& print, FILE* file)
             /* If we are there, current extruder wouldn't be used,
              * so this color change is a redundant move.
              * Delete this item from m_custom_gcode_per_print_z
-             * */
+             * /
             it = m_custom_gcode_per_print_z.erase(it);
             delete_executed = true;
         }
@@ -1163,7 +1165,7 @@ void GCode::_do_export(Print& print, FILE* file)
         if (delete_executed)
             model->custom_gcode_per_print_z = m_custom_gcode_per_print_z;
     }
-
+*/
 
     m_cooling_buffer->set_current_extruder(initial_extruder_id);
 

src/libslic3r/Model.cpp

@@ -19,6 +19,7 @@
 #include "SVG.hpp"
 #include <Eigen/Dense>
 #include "GCodeWriter.hpp"
+#include "GCode/PreviewData.hpp"
 
 namespace Slic3r {
 
@@ -125,6 +126,8 @@ Model Model::read_from_file(const std::string& input_file, DynamicPrintConfig* c
     if (add_default_instances)
         model.add_default_instances();
 
+    update_custom_gcode_per_print_z_from_config(model.custom_gcode_per_print_z, config);
+
     return model;
 }
 
@@ -160,6 +163,8 @@ Model Model::read_from_archive(const std::string& input_file, DynamicPrintConfig
     if (add_default_instances)
         model.add_default_instances();
 
+    update_custom_gcode_per_print_z_from_config(model.custom_gcode_per_print_z, config);
+
     return model;
 }
 
@@ -1933,6 +1938,30 @@ extern bool model_has_advanced_features(const Model &model)
     return false;
 }
 
+extern void update_custom_gcode_per_print_z_from_config(std::vector<Model::CustomGCode>& custom_gcode_per_print_z, DynamicPrintConfig* config)
+{
+    if (!config->has("colorprint_heights"))
+        return;
+
+    const std::vector<std::string>& colors = GCodePreviewData::ColorPrintColors();
+
+    const auto& colorprint_values = config->option<ConfigOptionFloats>("colorprint_heights")->values;
+    
+    if (!colorprint_values.empty())
+    {
+        custom_gcode_per_print_z.clear();
+        custom_gcode_per_print_z.reserve(colorprint_values.size());
+        int i = 0;
+        for (auto val : colorprint_values)
+            custom_gcode_per_print_z.emplace_back(Model::CustomGCode{ val, ColorChangeCode, 1, colors[(++i)%7] });
+    }
+
+    /* There is one and only place this configuration option is used now.
+     * It wouldn't be used in the future, so erase it.
+     * */
+    config->erase("colorprint_heights");
+}
+
 #ifndef NDEBUG
 // Verify whether the IDs of Model / ModelObject / ModelVolume / ModelInstance / ModelMaterial are valid and unique.
 void check_model_ids_validity(const Model &model)

src/libslic3r/Model.hpp

@@ -874,6 +874,10 @@ extern bool model_volume_list_changed(const ModelObject &model_object_old, const
 extern bool model_has_multi_part_objects(const Model &model);
 // If the model has advanced features, then it cannot be processed in simple mode.
 extern bool model_has_advanced_features(const Model &model);
+/* If loaded configuration has a "colorprint_heights" option (if it was imported from older Slicer), 
+ * then model.custom_gcode_per_print_z should be updated considering this option
+ * */
+extern void update_custom_gcode_per_print_z_from_config(std::vector<Model::CustomGCode>& custom_gcode_per_print_z, DynamicPrintConfig* config);
 
 #ifndef NDEBUG
 // Verify whether the IDs of Model / ModelObject / ModelVolume / ModelInstance / ModelMaterial are valid and unique.