fix: mixins-hasInGenerations logic bug

Author: betterRunner

src/components/mixins.js

@@ -17,12 +17,13 @@ function getDragNode (guid) {
 }
 
 function hasInGenerations (root, node) {
+  let ret = false
   if (root.hasOwnProperty('children') && root.children) {
     for (let rn of root.children) {
       if (rn === node) return true
-      if (rn.children) return hasInGenerations(rn, node)
+      if (rn.children) ret |= hasInGenerations(rn, node)
     }
-    return false
+    return ret
   }
 }