fbx: change import option defaults

ufbx has special logic to handle animation/trimming, and most users expect trimming to be on.
For existing projects, we should upgrade files0 to FBX2glTF to preserve node compatibility.

editor/import/3d/resource_importer_scene.cpp

@@ -2329,6 +2329,7 @@ void ResourceImporterScene::get_import_options(const String &p_path, List<Import
 		}
 		script_ext_hint += "*." + E;
 	}
+	bool trimming_defaults_on = p_path.get_extension().to_lower() == "fbx";
 
 	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "nodes/apply_root_scale"), true));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "nodes/root_scale", PROPERTY_HINT_RANGE, "0.001,1000,0.001"), 1.0));
@@ -2342,7 +2343,7 @@ void ResourceImporterScene::get_import_options(const String &p_path, List<Import
 	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "skins/use_named_skins"), true));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "animation/import"), true));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "animation/fps", PROPERTY_HINT_RANGE, "1,120,1"), 30));
-	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "animation/trimming"), false));
+	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "animation/trimming"), trimming_defaults_on));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "animation/remove_immutable_tracks"), true));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "animation/import_rest_as_RESET"), false));
 	r_options->push_back(ImportOption(PropertyInfo(Variant::STRING, "import_script/path", PROPERTY_HINT_FILE, script_ext_hint), ""));

editor/import_dock.cpp

@@ -188,10 +188,20 @@ void ImportDock::_update_options(const String &p_path, const Ref<ConfigFile> &p_
 	params->checked.clear();
 	params->base_options_path = p_path;
 
+	HashMap<StringName, Variant> import_options;
+	List<String> section_keys;
+	p_config->get_section_keys("params", &section_keys);
+	for (const String &section_key : section_keys) {
+		import_options[section_key] = p_config->get_value("params", section_key);
+	}
+	if (params->importer.is_valid()) {
+		params->importer->handle_compatibility_options(import_options);
+	}
+
 	for (const ResourceImporter::ImportOption &E : options) {
 		params->properties.push_back(E.option);
-		if (p_config.is_valid() && p_config->has_section_key("params", E.option.name)) {
-			params->values[E.option.name] = p_config->get_value("params", E.option.name);
+		if (p_config.is_valid() && import_options.has(E.option.name)) {
+			params->values[E.option.name] = import_options[E.option.name];
 		} else {
 			params->values[E.option.name] = E.default_value;
 		}

modules/fbx/editor/editor_scene_importer_ufbx.cpp

@@ -111,7 +111,7 @@ void EditorSceneFormatImporterUFBX::get_import_options(const String &p_path,
 
 void EditorSceneFormatImporterUFBX::handle_compatibility_options(HashMap<StringName, Variant> &p_import_params) const {
 	if (!p_import_params.has("fbx/importer")) {
-		p_import_params["fbx/importer"] = EditorSceneFormatImporterUFBX::FBX_IMPORTER_UFBX;
+		p_import_params["fbx/importer"] = EditorSceneFormatImporterUFBX::FBX_IMPORTER_FBX2GLTF;
 	}
 }