Feature flag the digest emails setting to staging.

(imported from commit 1239ce31281850dccf8f65d0c7156bd2c86ca3a7)

static/js/feature_flags.js

@@ -44,6 +44,7 @@ exports.left_side_userlist = _.contains(['customer7.invalid'], page_params.domai
 exports.fade_users_when_composing = page_params.staging || is_customer4;
 exports.use_socket = false;
 exports.clicking_notification_causes_narrow = page_params.staging || _.contains(['customer25.invalid'], page_params.domain);
+exports.show_digest_email_setting = page_params.staging;
 
 var zoom_realms = [
     'customer10.invalid',

static/js/settings.js

@@ -25,6 +25,9 @@ exports.avatar_stamp = Math.floor(Math.random()*100);
 
 $(function () {
 
+    if (!feature_flags.show_digest_email_setting) {
+        $("#digest_container").hide();
+    }
 
     function upload_avatar(file_input) {
         var form_data = new FormData();

templates/zerver/settings.html

@@ -150,7 +150,7 @@
           </label>
         </div>
 
-        <div class="control-group">
+        <div class="control-group" id="digest_container">
           <div class="controls">
             <input type="checkbox" name="enable_digest_emails" id="enable_digest_emails"
               {% if user_profile.enable_digest_emails %}