QoL: exclude handy model dir from recent list (#11934)

* Enhance backward compatibility for filament extruder variants in 3MF project files
Fix crashes when loading old 3MF project

* QoL: add handy models directory to ignore list

src/libslic3r/Utils.hpp

@@ -170,6 +170,9 @@ const std::string& sys_shapes_dir();
 // Return a full path to the custom shapes gallery directory.
 std::string custom_shapes_dir();
 
+// Return a full path to the handy models directory.
+std::string handy_models_dir();
+
 // Set a path with shapes gallery files.
 void set_custom_gcodes_dir(const std::string &path);
 // Return a full path to the system shapes gallery directory.

src/libslic3r/utils.cpp

@@ -295,6 +295,11 @@ std::string custom_shapes_dir()
     return (boost::filesystem::path(g_data_dir) / "shapes").string();
 }
 
+std::string handy_models_dir()
+{
+    return (boost::filesystem::path(resources_dir()) / "handy_models").string();
+}
+
 static std::atomic<bool> debug_out_path_called(false);
 
 std::string debug_out_path(const char *name, ...)
@@ -1028,7 +1033,7 @@ bool is_gallery_file(const std::string &path, char const* type)
 
 bool is_shapes_dir(const std::string& dir)
 {
-	return dir == sys_shapes_dir() || dir == custom_shapes_dir();
+	return dir == sys_shapes_dir() || dir == custom_shapes_dir() || dir == handy_models_dir();
 }
 
 } // namespace Slic3r