Fix plugin settings lost on cloud metadata refresh

Cloud catalog records never carry [tool.orcaslicer.plugin.settings], so the
metadata merge wiped the locally-parsed settings and plugins silently ran on
their built-in defaults (ctx.params arrived empty).

tests/slic3rutils/test_slicing_pipeline_params.cpp

@@ -0,0 +1,160 @@
+#include <catch2/catch_all.hpp>
+
+#include <libslic3r/Utils.hpp>
+#include <slic3r/plugin/PluginDescriptor.hpp>
+#include <slic3r/plugin/PluginManager.hpp>
+#include <slic3r/plugin/PythonInterpreter.hpp>
+
+#include "fff_print/test_helpers.hpp"
+
+#include <boost/filesystem.hpp>
+#include <pybind11/embed.h>
+
+#include <fstream>
+#include <string>
+
+using namespace Slic3r;
+using namespace Slic3r::Test;
+namespace fs = boost::filesystem;
+
+// End-to-end coverage of ctx.params for slicing-pipeline capabilities: discovery parses
+// [tool.orcaslicer.plugin.settings] from the PEP-723 header, and the real dispatch
+// (execute_capabilities_from_refs -> hook -> GIL -> trampoline) hands it to the plugin.
+// A break anywhere in that chain makes plugins silently run on their built-in defaults,
+// which is invisible to the plugin author (Twistify incident, 2026-07-17).
+
+namespace {
+
+struct ScopedDataDir
+{
+    std::string previous;
+    fs::path    dir;
+
+    explicit ScopedDataDir(const std::string& tag)
+    {
+        previous = data_dir();
+        // canonical(): the plugin audit canonicalizes its allowed roots, so a path through
+        // the macOS /var -> /private/var symlink would be rejected as "outside allowed root".
+        dir = fs::canonical(fs::temp_directory_path()) / fs::unique_path("orca-" + tag + "-%%%%-%%%%");
+        fs::create_directories(dir);
+        set_data_dir(dir.string());
+    }
+
+    ~ScopedDataDir()
+    {
+        set_data_dir(previous);
+        boost::system::error_code ec;
+        fs::remove_all(dir, ec);
+    }
+
+    fs::path plugins_dir() const { return dir / "orca_plugins"; }
+};
+
+struct ScopedPluginManager
+{
+    bool initialized = false;
+
+    ScopedPluginManager() { initialized = PluginManager::instance().initialize(); }
+    ~ScopedPluginManager()
+    {
+        PluginManager::instance().shutdown();
+        PythonInterpreter::instance().shutdown();
+    }
+};
+
+const char* const PARAM_PROBE_SOURCE = R"PY(# /// script
+# requires-python = ">=3.12"
+#
+# [tool.orcaslicer.plugin]
+# name = "Param Probe"
+# description = "Echoes ctx.params back to the test"
+# author = "OrcaSlicer"
+# version = "1.0"
+# type = "slicing-pipeline"
+#
+# [tool.orcaslicer.plugin.settings]
+# alpha = "1.25"
+# beta = "hello"
+# ///
+import orca
+
+class ParamEcho(orca.slicing.SlicingPipelineCapabilityBase):
+    def get_name(self):
+        return "ParamEcho"
+
+    def execute(self, ctx):
+        if ctx.step != orca.slicing.Step.posSlice or ctx.object is None:
+            return orca.ExecutionResult.success()
+        try:
+            text = repr(sorted(dict(ctx.params).items()))
+        except Exception as e:  # what plugins' defaults-fallback code swallows silently
+            text = "params-error: " + repr(e)
+        orca._probe_params = text  # read back by the test through pybind
+        return orca.ExecutionResult.success("params probed")
+
+@orca.plugin
+class ParamProbePackage(orca.base):
+    def register_capabilities(self):
+        orca.register_capability(ParamEcho)
+)PY";
+
+fs::path write_plugin(const ScopedDataDir& data_dir_guard, const std::string& stem, const std::string& source)
+{
+    const fs::path plugin_dir = data_dir_guard.plugins_dir() / stem;
+    fs::create_directories(plugin_dir);
+
+    std::ofstream out((plugin_dir / (stem + ".py")).string(), std::ios::binary);
+    out << source;
+    out.close();
+
+    return plugin_dir;
+}
+
+} // namespace
+
+TEST_CASE("slicing-pipeline dispatch delivers PEP-723 settings as ctx.params", "[slicing_pipeline][Python]")
+{
+    ScopedPluginManager plugin_system;
+    if (!plugin_system.initialized)
+        SKIP("Bundled Python interpreter unavailable: " + PythonInterpreter::instance().last_error());
+
+    ScopedDataDir data_dir_guard("pipeline-params");
+    write_plugin(data_dir_guard, "ParamProbe", PARAM_PROBE_SOURCE);
+
+    PluginManager& manager = PluginManager::instance();
+    manager.discover_plugins(/*async=*/false, /*clear=*/true);
+
+    std::string error;
+    manager.load_plugin("ParamProbe", /*skip_deps=*/true, {});
+    REQUIRE(manager.wait_for_plugin_load("ParamProbe", std::chrono::seconds(120), error));
+    INFO("load error: " << error);
+    REQUIRE(manager.is_plugin_loaded("ParamProbe"));
+
+    // The manager serves the header settings for the key the dispatch resolves by.
+    const auto settings = manager.get_plugin_settings("ParamProbe");
+    REQUIRE(settings.count("alpha") == 1);
+    CHECK(settings.at("alpha") == "1.25");
+
+    // Slice with the capability selected, exactly as a preset would reference it.
+    Print print;
+    Model model;
+    auto  config = DynamicPrintConfig::full_print_config();
+    config.set_key_value("slicing_pipeline_plugin", new ConfigOptionStrings({"ParamEcho"}));
+    config.set_key_value("plugins", new ConfigOptionStrings({"ParamProbe;;ParamEcho"}));
+    init_print({cube(20)}, print, model, config);
+    print.process();
+
+    std::string observed = "<capability never executed>";
+    {
+        PythonGILState gil;
+        REQUIRE(static_cast<bool>(gil));
+        pybind11::module_ orca = pybind11::module_::import("orca");
+        if (pybind11::hasattr(orca, "_probe_params"))
+            observed = orca.attr("_probe_params").cast<std::string>();
+    }
+    INFO("ctx.params observed by Python: " << observed);
+    CHECK(observed.find("'alpha', '1.25'") != std::string::npos);
+    CHECK(observed.find("'beta', 'hello'") != std::string::npos);
+
+    manager.unload_plugin("ParamProbe");
+}