org settings: Use save/discard widget for notification stream settings.

Currently, if we change stream we see the immediate saving of stream, but
it is more convenient to have "Save" and "Discard" buttons as we use
everywhere else in the organization setting subsystem.

frontend_tests/casper_tests/10-admin.js

@@ -23,6 +23,15 @@ casper.then(function () {
     casper.click("li[data-section='organization-settings']");
 });
 
+function submit_notifications_stream_settings() {
+    casper.waitUntilVisible('#org-submit-notifications[data-status="unsaved"]', function () {
+        casper.test.assertSelectorHasText('#org-submit-notifications', 'Save');
+    });
+    casper.then(function () {
+        casper.click('#org-submit-notifications');
+    });
+}
+
 // Test changing notifications stream
 casper.then(function () {
     casper.test.info('Changing notifications stream to Verona by filtering with "verona"');
@@ -33,6 +42,8 @@ casper.then(function () {
         casper.click("#id_realm_notifications_stream .dropdown-list-body li.stream_name");
     });
 
+    submit_notifications_stream_settings();
+
     casper.waitUntilVisible('#org-submit-notifications[data-status="saved"]', function () {
         casper.test.assertSelectorHasText('#org-submit-notifications', 'Saved');
     });
@@ -40,6 +51,9 @@ casper.then(function () {
 
 casper.then(function () {
     casper.click("#notifications_stream_disable");
+
+    submit_notifications_stream_settings();
+
     casper.waitUntilVisible('#org-submit-notifications[data-status="saved"]', function () {
         casper.test.assertSelectorHasText('#org-submit-notifications', 'Saved');
     });
@@ -55,6 +69,8 @@ casper.then(function () {
         casper.click("#id_realm_signup_notifications_stream .dropdown-list-body li.stream_name");
     });
 
+    submit_notifications_stream_settings();
+
     casper.waitUntilVisible('#org-submit-notifications[data-status="saved"]', function () {
         casper.test.assertSelectorHasText('#org-submit-notifications', 'Saved');
     });
@@ -62,6 +78,9 @@ casper.then(function () {
 
 casper.then(function () {
     casper.click("#signup_notifications_stream_disable");
+
+    submit_notifications_stream_settings();
+
     casper.waitUntilVisible('#org-submit-notifications[data-status="saved"]', function () {
         casper.test.assertSelectorHasText('#org-submit-notifications', 'Saved');
     });

static/js/settings_org.js

@@ -192,6 +192,14 @@ function get_property_value(property_name) {
         return JSON.stringify(page_params[property_name]);
     }
 
+    if (property_name === 'realm_notifications_stream') {
+        return page_params.realm_notifications_stream_id;
+    }
+
+    if (property_name === 'realm_signup_notifications_stream') {
+        return page_params.realm_signup_notifications_stream_id;
+    }
+
     return page_params[property_name];
 }
 
@@ -520,6 +528,10 @@ function discard_property_element_changes(elem) {
 
     if (property_name === 'realm_authentication_methods') {
         exports.populate_auth_methods(property_value);
+    } else if (property_name === 'realm_notifications_stream') {
+        exports.render_notifications_stream_ui(property_value, "notifications");
+    } else if (property_name === 'realm_signup_notifications_stream') {
+        exports.render_notifications_stream_ui(property_value, "signup_notifications");
     } else if (typeof property_value === 'boolean') {
         elem.prop('checked', property_value);
     } else if (typeof property_value === 'string' || typeof property_value === 'number') {
@@ -675,6 +687,10 @@ exports.build_page = function () {
             current_val = JSON.stringify(current_val);
             changed_val = get_auth_method_table_data();
             changed_val = JSON.stringify(changed_val);
+        } else if (property_name === 'realm_notifications_stream') {
+            changed_val = parseInt($("#id_realm_notifications_stream").data('stream-id'), 10);
+        } else if (property_name === 'realm_signup_notifications_stream') {
+            changed_val = parseInt($("#id_realm_signup_notifications_stream").data('stream-id'), 10);
         } else if (typeof current_val === 'boolean') {
             changed_val = elem.prop('checked');
         } else if (typeof current_val === 'string') {
@@ -685,7 +701,6 @@ exports.build_page = function () {
         } else {
             blueslip.error('Element refers to unknown property ' + property_name);
         }
-
         return current_val !== changed_val;
     }
 
@@ -786,6 +801,11 @@ exports.build_page = function () {
                 data.message_content_delete_limit_seconds =
                     exports.msg_delete_limit_dropdown_values[delete_limit_setting_value].seconds;
             }
+        } else if (subsection === 'notifications') {
+            data.notifications_stream_id = JSON.stringify(
+                parseInt($('#id_realm_notifications_stream').data('stream-id'), 10));
+            data.signup_notifications_stream_id = JSON.stringify(
+                parseInt($('#id_realm_signup_notifications_stream').data('stream-id'), 10));
         } else if (subsection === 'other_settings') {
             let new_message_retention_days = $("#id_realm_message_retention_days").val();
 
@@ -1074,10 +1094,7 @@ exports.build_page = function () {
 
     function notification_stream_update(stream_id, notification_type) {
         exports.render_notifications_stream_ui(stream_id, notification_type);
-        exports.save_organization_settings({
-            [`${notification_type}_stream_id`]: JSON.stringify(parseInt(stream_id, 10)),
-        }, $("#org-submit-notifications"));
-
+        save_discard_widget_status_handler($('#org-notifications'));
     }
 
     $(".notifications-stream-setting .dropdown-list-body").on("click keypress", ".stream_name", function (e) {

static/templates/settings/notifications_stream_settings_widget.hbs

@@ -1,7 +1,7 @@
 <div class="input-group">
     <label for="realm_{{ notifications_type }}_stream" id="realm_{{ notifications_type }}_stream_label" class="inline-block">
         {{ label }}
-        <span class="notifications-stream-setting dropup actual-dropdown-menu" id="id_realm_{{ notifications_type }}_stream"
+        <span class="notifications-stream-setting dropup actual-dropdown-menu prop-element" id="id_realm_{{ notifications_type }}_stream"
           name="realm_{{ notifications_type }}_stream" aria-labelledby="realm_{{ notifications_type }}_stream_label"
           data-notifications-type="{{ notifications_type }}">
             <button class="button small rounded dropdown-toggle" data-toggle="dropdown">