bump flatpak version

scripts/flatpak/com.orcaslicer.OrcaSlicer.metainfo.xml

@@ -45,8 +45,8 @@
         <color type="primary" scheme_preference="dark">#00695C</color>
     </branding>
     <releases>
-        <release version="2.4.0-dev" date="2026-05-22" type="development">
-            <url type="details">https://github.com/OrcaSlicer/OrcaSlicer/releases/tag/nightly-builds</url>
+        <release version="2.4.0-alpha" date="2026-05-22" type="development">
+            <url type="details">https://github.com/OrcaSlicer/OrcaSlicer/releases/tag/2.4.0-alpha</url>
             <description>
                 <p>See the release page for detailed changelog.</p>
             </description>

src/libslic3r/MultiMaterialSegmentation.cpp

@@ -2195,7 +2195,7 @@ std::vector<std::vector<ExPolygons>> segmentation_by_painting(const PrintObject
 
 // Returns multi-material segmentation based on painting in multi-material segmentation gizmo
 std::vector<std::vector<ExPolygons>> multi_material_segmentation_by_painting(const PrintObject &print_object, const std::function<void()> &throw_on_cancel_callback) {
-    const size_t num_facets_states  = print_object.print()->config().filament_diameter.size() + 1;
+    const size_t num_facets_states  = print_object.print()->config().filament_colour.size() + 1;
     const float  max_width          = float(print_object.config().mmu_segmented_region_max_width.value);
     const float  interlocking_depth = float(print_object.config().mmu_segmented_region_interlocking_depth.value);
     const bool   interlocking_beam  = print_object.config().interlocking_beam.value;

src/libslic3r/PrintObjectSlice.cpp

@@ -883,6 +883,7 @@ static inline void apply_mm_segmentation(PrintObject &print_object, ThrowOnCance
             double       z              = print_object.get_layer(int(range.begin()))->slice_z;
             auto         it_layer_range = layer_range_first(layer_ranges, z);
             // BBS
+            const size_t num_extruders = print_object.print()->config().filament_diameter.size();
 
             struct ByExtruder {
                 ExPolygons  expolygons;
@@ -902,7 +903,6 @@ static inline void apply_mm_segmentation(PrintObject &print_object, ThrowOnCance
                 it_layer_range = layer_range_next(layer_ranges, it_layer_range, layer.slice_z);
                 const PrintObjectRegions::LayerRangeRegions &layer_range = *it_layer_range;
                 // Gather per extruder expolygons.
-                const size_t num_extruders = segmentation[layer_id].size();
                 by_extruder.assign(num_extruders, ByExtruder());
                 by_region.assign(layer.region_count(), ByRegion());
                 bool layer_split = false;

version.inc

@@ -7,7 +7,7 @@ set(SLIC3R_APP_KEY "OrcaSlicer")
 if(NOT DEFINED BBL_INTERNAL_TESTING)
 set(BBL_INTERNAL_TESTING "0")
 endif()
-set(SoftFever_VERSION "2.4.0-dev")
+set(SoftFever_VERSION "2.4.0-alpha")
 string(REGEX MATCH "^([0-9]+)\\.([0-9]+)\\.([0-9]+)"
        SoftFever_VERSION_MATCH ${SoftFever_VERSION})
 set(ORCA_VERSION_MAJOR ${CMAKE_MATCH_1})