feat: Python Plugins

src/libslic3r/Preset.cpp

@@ -1192,6 +1192,8 @@ static std::vector<std::string> s_Preset_print_options{
     "min_feature_size",
     "min_bead_width",
     "post_process",
+    "post_process_plugin",
+    "plugins",
     "process_change_extrusion_role_gcode",
     "min_length_factor",
     "wall_maximum_resolution",
@@ -3390,7 +3392,18 @@ void add_correct_opts_to_diff(const std::string &opt_key, t_config_option_keys&
 
     for (int i = 0; i < int(opt_cur->values.size()); i++)
     {
-        int init_id = i <= opt_init_max_id ? i : 0;
+        const bool is_new_index = i > opt_init_max_id;
+        int init_id = is_new_index ? 0 : i;
+        if (is_new_index) {
+            // Orca: intentional divergence from upstream. Any new vector index (at or
+            // beyond the reference vector's length) is flagged dirty unconditionally --
+            // independent of its value and nil-state -- so preset dirty-detection notices
+            // per-extruder/filament entries added by growth (e.g. extruder count). This
+            // applies to every vector option type routed through deep_diff().
+            // Covered by tests/libslic3r/test_preset_diff.cpp.
+            vec.emplace_back(opt_key + "#" + std::to_string(i));
+            continue;
+        }
         if (opt_cur->values[i] != opt_init->values[init_id]) {
             if (opt_cur->nullable()) {
                 if (opt_cur->is_nil(i)) {