Prefetch xpost suggestions in Gutenberg

WordPress/Classes/Services/SiteSuggestionService.swift

@@ -34,6 +34,17 @@ class SiteSuggestionService {
         }
     }
 
+    /**
+     If no suggestions already in Core Data, fetch them from the network and store them in Core Data.
+     @param blog The blog/site to prefetch suggestions for
+     */
+    func prefetchSuggestions(for blog: Blog) {
+        let persistedSuggestions = retrievePersistedSuggestions(for: blog)
+        if persistedSuggestions == nil || persistedSuggestions?.isEmpty == true {
+            fetchAndPersistSuggestions(for: blog, completion: { _ in})
+        }
+    }
+
     /**
     Performs a REST API request for the given blog.
     Persists response objects to Core Data.

WordPress/Classes/ViewRelated/Gutenberg/GutenbergViewController.swift

@@ -345,6 +345,8 @@ class GutenbergViewController: UIViewController, PostEditor {
         }, failure: { (error) in
             DDLogError("Error syncing JETPACK: \(String(describing: error))")
         })
+
+        SiteSuggestionService.shared.prefetchSuggestions(for: self.post.blog)
     }
 
     override func viewWillAppear(_ animated: Bool) {

WordPress/Classes/ViewRelated/Post/PostEditor+BlogPicker.swift

@@ -28,6 +28,10 @@ extension PostEditor where Self: UIViewController {
             }
             self.recreatePostRevision(in: blog)
             self.mediaLibraryDataSource = MediaLibraryPickerDataSource(post: self.post)
+
+            if self.editorSession.currentEditor == .gutenberg {
+                SiteSuggestionService.shared.prefetchSuggestions(for: self.post.blog)
+            }
         }
 
         let dismissHandler: BlogSelectorDismissHandler = {