Chrome export fixes: too-long names, redact group ids (#1402)

* On export, don't print out entire group id, just last three chars

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* Export: Limit conversation dirs to 30 characters of original name

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* Redact groups ids on import as well

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* InboxView: Protect against nonexistent loading screen

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js/backup.js

@@ -403,16 +403,20 @@
   function getConversationDirName(conversation) {
     var name = conversation.active_at || 'never';
     if (conversation.type === 'private') {
-      name += ' (' + (conversation.name || conversation.id) + ')';
+      name += ' (' + (conversation.name || conversation.id).slice(0, 30) + ')';
     } else {
-      name += ' (' + conversation.name + ')';
+      name += ' (' + conversation.name.slice(0, 30) + ')';
     }
     return name;
   }
 
   function getConversationLoggingName(conversation) {
     var name = conversation.active_at || 'never';
+    if (conversation.type === 'private') {
       name += ' (' + conversation.id + ')';
+    } else {
+      name += ' ([REDACTED_GROUP]' + conversation.id.slice(-3) + ')';
+    }
     return name;
   }
 
@@ -539,7 +543,7 @@
               'Done importing',
               messages.length,
               'messages for conversation',
-              conversationId
+              '[REDACTED]' + conversationId.slice(-3)
             );
             resolve();
           }

js/views/inbox_view.js

@@ -150,8 +150,10 @@
                 banner.$el.prependTo(this.$el);
                 this.$el.addClass('expired');
             } else if (Whisper.Migration.inProgress()) {
+                if (this.appLoadingScreen) {
                     this.appLoadingScreen.remove();
                     this.appLoadingScreen = null;
+                }
                 this.showMigrationScreen();
             } else if (storage.get('migrationEnabled')) {
                 var migrationBanner = new Whisper.MigrationAlertBanner().render();