change to more versatile merge behaviour

src/shared/getMetaInfo.js

@@ -9,40 +9,29 @@ import getComponentOption from './getComponentOption'
  */
 export default function getMetaInfo (component) {
   // collect & aggregate all metaInfo $options
-  const info = getComponentOption({
+  let info = getComponentOption({
     component,
     option: 'metaInfo',
     deep: true,
-    // In order to prevent certain tags from being overwritten,
-    // (like <meta name="description" ...> being overwritten by
-    // <meta name="keywords" ...>), we need to specify a different
-    // array merge strategy. This strategy exploits a trick
-    // with associative arrays in JS using O(1) lookup
-
-    /* eslint-disable no-labels */
-    arrayMerge (oldTags, newTags) {
-      const updatedTags = []
-      for (let oldTagIndex in oldTags) {
-        const oldTag = oldTags[oldTagIndex]
-        let sharedAttributes = false
-        ifTagsHaveEqualSharedAttributeValues: for (let newTagIndex in newTags) {
-          const newTag = newTags[newTagIndex]
-          for (let attribute in newTag) {
-            if (newTag.hasOwnProperty(attribute) && oldTag.hasOwnProperty(attribute)) {
-              if (oldTag[attribute] === newTag[attribute]) {
-                sharedAttributes = true
-                break ifTagsHaveEqualSharedAttributeValues
-              }
-            }
+    arrayMerge (target, source) {
+      const destination = []
+      for (let targetIndex in target) {
+        const targetItem = target[targetIndex]
+        let shared = false
+        for (let sourceIndex in source) {
+          const sourceItem = source[sourceIndex]
+          if (targetItem.vmid === sourceItem.vmid) {
+            shared = true
+            break
           }
         }
-        if (!sharedAttributes) {
-          updatedTags.push(oldTag)
+        if (!shared) {
+          destination.push(targetItem)
         }
       }
-      return updatedTags.concat(newTags)
+
+      return destination.concat(source)
     }
-    /* eslint-enable no-labels */
   })
 
   // if any info options are a function, coerce them to the result of a call