devonfw#1696: fixed ContextConfiguration merge

cobigen/cobigen-core/src/main/java/com/devonfw/cobigen/impl/config/ContextConfiguration.java

@@ -4,6 +4,7 @@
 import java.math.BigDecimal;
 import java.nio.file.Path;
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -21,7 +22,7 @@ public class ContextConfiguration {
   /**
    * All available {@link Trigger}s
    */
-  private Map<String, Trigger> triggers;
+  private Map<String, Trigger> triggers = new HashMap<>();
 
   /**
    * Path of the configuration. Might point to a folder or a jar or maybe even something different in future.
@@ -80,12 +81,17 @@ public Trigger getTrigger(String id) {
 
   /**
    * Merges another context configuration into _this_ context configuration instance
-   * 
+   *
    * @param contextConfiguration to be merged
    */
   public ContextConfiguration merge(ContextConfiguration contextConfiguration) {
 
-    triggers.putAll(contextConfiguration.triggers);
+    List<Trigger> contextTriggers = contextConfiguration.getTriggers();
+    Map<String, Trigger> triggerMap = new HashMap<>();
+    for (Trigger trigger : contextTriggers) {
+      triggerMap.put(trigger.getId(), trigger);
+    }
+    triggers.putAll(triggerMap);
     return this;
   }
 }