Materials: Child ignoring parent material

Inherit the material from the parent object when creating a new object,
such as during a boolean operation, or when extruding a sketch.

fixes #15503

src/Mod/Part/App/FeaturePartCommon.cpp

@@ -117,6 +117,10 @@ App::DocumentObjectExecReturn *MultiCommon::execute()
         res = res.makeElementRefine();
     }
     this->Shape.setValue(res);
+    if (Shapes.getSize() > 0) {
+        App::DocumentObject* link = Shapes.getValues()[0];
+        copyMaterial(link);
+    }
 
     return Part::Feature::execute();
 }