now inheriting due date when child task is created

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

core/src/main/java/de/srsoftware/umbrella/core/model/Task.java

@@ -65,6 +65,11 @@ public class Task implements Mappable {
 		return this;
 	}
 
+	public Task dueDate(LocalDate newValue) {
+		dueDate = newValue;
+		return this;
+	}
+
 	public LocalDate dueDate(){
 		return dueDate;
 	}

task/src/main/java/de/srsoftware/umbrella/task/TaskModule.java

@@ -355,6 +355,7 @@ public class TaskModule extends BaseHandler implements TaskService {
 
 		json.put(MEMBERS, Map.of()); // reset member map for task-to-be-created
 		Task task = Task.of(json);
+		if (parentTask != null && parentTask.dueDate() != null && task.dueDate() == null) task.dueDate(parentTask.dueDate());
 		task = taskDb.save(task);
 
 		// do actual member assignment