Merge branch 'master' of https://github.com/prusa3d/Slic3r

src/libslic3r/Model.cpp

@@ -1461,6 +1461,15 @@ int ModelVolume::extruder_id() const
     return extruder_id;
 }
 
+bool ModelVolume::is_splittable() const
+{
+    // the call mesh.has_multiple_patches() is expensive, so cache the value to calculate it only once
+    if (m_is_splittable == -1)
+        m_is_splittable = (int)mesh.has_multiple_patches();
+
+    return m_is_splittable == 1;
+}
+
 void ModelVolume::center_geometry()
 {
 #if ENABLE_VOLUMES_CENTERING_FIXES