fix sync bookmarks hierarchy

fix #7971

Test Plan:
1. open pyramid 0, enable sync
2. bookmark bing.com
3. create a folder
4. move the bing bookmark into the folder
5. open pyramid 1, sync it to pyramid 0
6. a folder should appear in pyramid 1 with bing inside the folder

js/state/syncUtil.js

@@ -61,8 +61,9 @@ let folderIdMap = new Immutable.Map()
  * Converts sync records into a form that can be consumed by AppStore.
  * @param {Object} record
  * @param {Immutable.Map} appState
+ * @param {Immutable.List=} records
  */
-module.exports.getSiteDataFromRecord = (record, appState) => {
+module.exports.getSiteDataFromRecord = (record, appState, records) => {
   const objectId = new Immutable.List(record.objectId)
   const category = CATEGORY_MAP[record.objectData].categoryName
   let existingObjectData
@@ -96,7 +97,7 @@ module.exports.getSiteDataFromRecord = (record, appState) => {
     const parentFolderObjectId = siteProps.parentFolderObjectId
     if (parentFolderObjectId && parentFolderObjectId.length > 0) {
       siteProps.parentFolderId =
-        getFolderIdByObjectId(new Immutable.List(parentFolderObjectId), appState)
+        getFolderIdByObjectId(new Immutable.List(parentFolderObjectId), appState, records)
     }
   }
   const siteDetail = new Immutable.Map(pickFields(siteProps, SITE_FIELDS))
@@ -303,16 +304,30 @@ module.exports.getObjectById = (objectId, category, appState) => {
  * Given an bookmark folder objectId, find the folder and return its folderId.
  * @param {Immutable.List} objectId
  * @param {Immutable.Map=} appState
+ * @param {Immutable.List=} records
  * @returns {number|undefined}
  */
-const getFolderIdByObjectId = (objectId, appState) => {
+const getFolderIdByObjectId = (objectId, appState, records) => {
   if (folderIdMap.has(objectId)) {
     return folderIdMap.get(objectId)
   }
+  let folderId
   const entry = module.exports.getObjectById(objectId, 'BOOKMARKS', appState)
-  if (!entry) { return undefined }
-  const folderId = entry[1].get('folderId')
-  folderIdMap = folderIdMap.set(objectId, folderId)
+  if (entry) {
+    folderId = entry[1].get('folderId')
+  } else if (records) {
+    // Look for a folder record with a matching object ID in this record batch
+    const matchingFolder = records.find((record) => {
+      record = Immutable.fromJS(record)
+      return record && objectId.equals(record.get('objectId')) && typeof record.getIn(['bookmark', 'site', 'folderId']) === 'number'
+    })
+    if (matchingFolder) {
+      folderId = matchingFolder.bookmark.site.folderId
+    }
+  }
+  if (folderId) {
+    folderIdMap = folderIdMap.set(objectId, folderId)
+  }
   return folderId
 }
 

js/stores/appStore.js

@@ -433,15 +433,22 @@ const handleAppAction = (action) => {
       nativeImage.copyDataURL(action.dataURL, action.html, action.text)
       break
     case appConstants.APP_APPLY_SITE_RECORDS:
+      let nextFolderId = siteUtil.getNextFolderId(appState.get('sites'))
+      // Ensure that all folders are assigned folderIds
+      action.records.forEach((record, i) => {
+        if (record.action !== writeActions.DELETE &&
+          record.bookmark && record.bookmark.isFolder &&
+          record.bookmark.site && !record.bookmark.site.folderId) {
+          record.bookmark.site.folderId = nextFolderId
+          action.records.set(i, record)
+          nextFolderId = nextFolderId + 1
+        }
+      })
       action.records.forEach((record) => {
-        const siteData = syncUtil.getSiteDataFromRecord(record, appState)
+        const siteData = syncUtil.getSiteDataFromRecord(record, appState, action.records)
         const tag = siteData.tag
         let siteDetail = siteData.siteDetail
         const sites = appState.get('sites')
-        if (record.action !== writeActions.DELETE &&
-          !siteDetail.get('folderId') && siteUtil.isFolder(siteDetail)) {
-          siteDetail = siteDetail.set('folderId', siteUtil.getNextFolderId(sites))
-        }
         switch (record.action) {
           case writeActions.CREATE:
             appState = appState.set('sites',