feat: Python Plugins

tests/libslic3r/test_preset_diff.cpp

@@ -0,0 +1,35 @@
+#include <catch2/catch_all.hpp>
+
+#include "libslic3r/Preset.hpp"
+#include "libslic3r/PrintConfig.hpp"
+
+#include <algorithm>
+
+using namespace Slic3r;
+
+// Regression test for the python-plugin branch's intentional divergence from
+// upstream in add_correct_opts_to_diff() (src/libslic3r/Preset.cpp): a vector
+// option entry whose index is beyond the reference vector's length is reported
+// dirty even when it duplicates an existing value. On main these duplicates
+// were NOT flagged. See the comment on add_correct_opts_to_diff() in src/libslic3r/Preset.cpp.
+TEST_CASE("deep_diff flags new vector entries that duplicate values[0]", "[PresetDiff][Config]")
+{
+    // reference: single-extruder vector (one entry)
+    Preset reference(Preset::TYPE_PRINTER, "ref");
+    reference.config.set_key_value("nozzle_diameter", new ConfigOptionFloats{0.4});
+
+    // edited: a second extruder entry was added whose value duplicates the first
+    Preset edited(Preset::TYPE_PRINTER, "edited");
+    edited.config.set_key_value("nozzle_diameter", new ConfigOptionFloats{0.4, 0.4});
+
+    // deep_compare = true routes through deep_diff() -> add_correct_opts_to_diff()
+    std::vector<std::string> diff =
+        PresetCollection::dirty_options(&edited, &reference, /*deep_compare=*/true);
+
+    // The new index #1 is reported dirty even though 0.4 == values[0] (0.4).
+    REQUIRE(std::find(diff.begin(), diff.end(), "nozzle_diameter#1") != diff.end());
+
+    // Sanity: the unchanged existing index #0 is NOT reported, so the rule is
+    // specific to new indices rather than flagging the whole vector.
+    REQUIRE(std::find(diff.begin(), diff.end(), "nozzle_diameter#0") == diff.end());
+}