Fix of "Build plate missing in view #1580"

Fixed import of the user config bundle to maintain the "inherits"
references to system profiles.

src/slic3r/GUI/Preset.cpp

@@ -1161,6 +1161,21 @@ std::string PresetCollection::name() const
     }
 }
 
+std::vector<std::string> PresetCollection::system_preset_names() const
+{
+    size_t num = 0;
+    for (const Preset &preset : m_presets)
+        if (preset.is_system)
+            ++ num;
+    std::vector<std::string> out;
+    out.reserve(num);
+	for (const Preset &preset : m_presets)
+		if (preset.is_system)
+			out.emplace_back(preset.name);
+    std::sort(out.begin(), out.end());
+    return out;
+}
+
 // Generate a file path from a profile name. Add the ".ini" suffix if it is missing.
 std::string PresetCollection::path_from_name(const std::string &new_name) const
 {

src/slic3r/GUI/Preset.hpp

@@ -365,6 +365,9 @@ public:
     std::vector<std::string>    current_different_from_parent_options(const bool deep_compare = false) const
         { return dirty_options(&this->get_edited_preset(), this->get_selected_preset_parent(), deep_compare); }
 
+    // Return a sorted list of system preset names.
+    std::vector<std::string>    system_preset_names() const;
+
     // Update the choice UI from the list of presets.
     // If show_incompatible, all presets are shown, otherwise only the compatible presets are shown.
     // If an incompatible preset is selected, it is shown as well.

src/slic3r/GUI/PresetBundle.cpp

@@ -876,7 +876,8 @@ void PresetBundle::load_config_file_config_bundle(const std::string &path, const
 // The presets starting with '*' are considered non-terminal and they are
 // removed through the flattening process by this function.
 // This function will never fail, but it will produce error messages through boost::log.
-static void flatten_configbundle_hierarchy(boost::property_tree::ptree &tree, const std::string &group_name)
+// system_profiles will not be flattened, and they will be kept inside the "inherits" field
+static void flatten_configbundle_hierarchy(boost::property_tree::ptree &tree, const std::string &group_name, const std::vector<std::string> &system_profiles)
 {
     namespace pt = boost::property_tree;
 
@@ -911,10 +912,16 @@ static void flatten_configbundle_hierarchy(boost::property_tree::ptree &tree, co
     for (const Prst &prst : presets) {
         // Parse the list of comma separated values, possibly enclosed in quotes.
         std::vector<std::string> inherits_names;
+        std::vector<std::string> inherits_system;
         if (Slic3r::unescape_strings_cstyle(prst.node->get<std::string>("inherits", ""), inherits_names)) {
             // Resolve the inheritance by name.
             std::vector<Prst*> &inherits_nodes = const_cast<Prst&>(prst).inherits;
             for (const std::string &node_name : inherits_names) {
+                auto it_system = std::lower_bound(system_profiles.begin(), system_profiles.end(), node_name);
+                if (it_system != system_profiles.end() && *it_system == node_name) {
+                    // Loading a user config budnle, this preset is derived from a system profile.
+                    inherits_system.emplace_back(node_name);
+                } else {
                     auto it = presets.find(Prst(node_name, nullptr));
                     if (it == presets.end())
                         BOOST_LOG_TRIVIAL(error) << "flatten_configbundle_hierarchy: The preset " << prst.name << " inherits an unknown preset \"" << node_name << "\"";
@@ -923,11 +930,20 @@ static void flatten_configbundle_hierarchy(boost::property_tree::ptree &tree, co
                         inherits_nodes.back()->parent_of.emplace_back(const_cast<Prst*>(&prst));
                     }
                 }
+            }
         } else {
             BOOST_LOG_TRIVIAL(error) << "flatten_configbundle_hierarchy: The preset " << prst.name << " has an invalid \"inherits\" field";
         }
-        // Remove the "inherits" key, it has no meaning outside the config bundle.
+        // Remove the "inherits" key, it has no meaning outside of the config bundle.
         const_cast<pt::ptree*>(prst.node)->erase("inherits");
+        if (! inherits_system.empty()) {
+            // Loaded a user config bundle, where a profile inherits a system profile.
+			// User profile should be derived from a single system profile only.
+			assert(inherits_system.size() == 1);
+			if (inherits_system.size() > 1)
+				BOOST_LOG_TRIVIAL(error) << "flatten_configbundle_hierarchy: The preset " << prst.name << " inherits from more than single system preset";
+			prst.node->put("inherits", Slic3r::escape_string_cstyle(inherits_system.front()));
+        }
     }
 
     // 2) Create a linear ordering for the directed acyclic graph of preset inheritance.
@@ -983,13 +999,14 @@ static void flatten_configbundle_hierarchy(boost::property_tree::ptree &tree, co
     }
 }
 
-static void flatten_configbundle_hierarchy(boost::property_tree::ptree &tree)
+// preset_bundle is set when loading user config bundles, which must not overwrite the system profiles.
+static void flatten_configbundle_hierarchy(boost::property_tree::ptree &tree, const PresetBundle *preset_bundle)
 {
-    flatten_configbundle_hierarchy(tree, "print");
+    flatten_configbundle_hierarchy(tree, "print",           preset_bundle ? preset_bundle->prints.system_preset_names()        : std::vector<std::string>());
-    flatten_configbundle_hierarchy(tree, "filament");
+    flatten_configbundle_hierarchy(tree, "filament",        preset_bundle ? preset_bundle->filaments.system_preset_names()     : std::vector<std::string>());
-    flatten_configbundle_hierarchy(tree, "sla_print");
+    flatten_configbundle_hierarchy(tree, "sla_print",       preset_bundle ? preset_bundle->sla_prints.system_preset_names()    : std::vector<std::string>());
-    flatten_configbundle_hierarchy(tree, "sla_material");
+    flatten_configbundle_hierarchy(tree, "sla_material",    preset_bundle ? preset_bundle->sla_materials.system_preset_names() : std::vector<std::string>());
-    flatten_configbundle_hierarchy(tree, "printer");
+    flatten_configbundle_hierarchy(tree, "printer",         preset_bundle ? preset_bundle->printers.system_preset_names()      : std::vector<std::string>());
 }
 
 // Load a config bundle file, into presets and store the loaded presets into separate files
@@ -1019,7 +1036,8 @@ size_t PresetBundle::load_configbundle(const std::string &path, unsigned int fla
     }
 
     // 1.5) Flatten the config bundle by applying the inheritance rules. Internal profiles (with names starting with '*') are removed.
-    flatten_configbundle_hierarchy(tree);
+    // If loading a user config bundle, do not flatten with the system profiles, but keep the "inherits" flag intact.
+    flatten_configbundle_hierarchy(tree, ((flags & LOAD_CFGBNDLE_SYSTEM) == 0) ? this : nullptr);
 
     // 2) Parse the property_tree, extract the active preset names and the profiles, save them into local config files.
     // Parse the obsolete preset names, to be deleted when upgrading from the old configuration structure.