function for group analysis added

packages/node_modules/@node-red/runtime/lib/flows/Flow.js

@@ -128,6 +128,65 @@ class Flow {
         }
         this.parent.log(msg);
     }
+	
+    /**
+     * Checks if node A and node B are in the same group. 
+     * Node B can also be placed in a subgroup.
+     * If node A is not in any group, false is returned
+     * @param {[type]} nodeIdA [description]
+     * @param {[type]} nodeIdB [description]
+     * @returns {[type]}       Returns true if all nodes are in the same group. If not, then false or if node A is not in a group then also false.
+     */
+	isNodeInSameGroup(nodeIdA, nodeIdB) {
+		const groups = this.global.groups;
+        let result = false;
+		for(let key in groups) {
+			let group = groups[key];
+            
+			if(!group.nodes.includes(nodeIdA.id)) {
+				continue;
+			}
+			
+			if(group.nodes.includes(nodeIdB.id)) {
+				result = true;
+                break;
+			}
+			
+            /**
+             * Subfunction to recursively search the groups for matches
+             * @param {[type]} targetNode  [description]
+             * @param {[type]} targetGroup [description]
+             * @returns Returns true if a match was found. Otherwise false.
+             */
+			const isInSubGroup = (targetNode, targetGroup) => {
+                let _result = false;
+				if(targetGroup.nodes.includes(targetNode.id)) {
+					_result = true;
+				} else {
+                    for(let nodeId of targetGroup.nodes) {
+                        let node = this.getGroupNode(nodeId);
+
+                        if(!node){
+                            continue;
+                        }
+
+                        if(node.type === "group"){
+                            let result = isInSubGroup(targetNode, node);
+                            if(result === true){
+                                _result = true;
+                                break;
+                            }
+                        }
+                    }
+                }
+
+				return _result;
+			};
+			
+			result = isInSubGroup(nodeIdB, group);
+		}
+		return result;
+	}
 
     /**
      * Start this flow.