message_move: Show confirmation toast.

A confirmation toast is shown when a message is moved
using the "Move only this message" option. The toast
contains the link to the new location of the message.

Fixes #29702

web/src/message_edit.js

@@ -8,6 +8,7 @@ import render_delete_message_modal from "../templates/confirm_dialog/confirm_del
 import render_confirm_merge_topics_with_rename from "../templates/confirm_dialog/confirm_merge_topics_with_rename.hbs";
 import render_confirm_moving_messages_modal from "../templates/confirm_dialog/confirm_moving_messages.hbs";
 import render_message_edit_form from "../templates/message_edit_form.hbs";
+import render_message_moved_widget_body from "../templates/message_moved_widget_body.hbs";
 import render_resolve_topic_time_limit_error_modal from "../templates/resolve_topic_time_limit_error_modal.hbs";
 import render_topic_edit_form from "../templates/topic_edit_form.hbs";
 
@@ -25,7 +26,9 @@ import * as confirm_dialog from "./confirm_dialog";
 import {show_copied_confirmation} from "./copied_tooltip";
 import * as dialog_widget from "./dialog_widget";
 import * as echo from "./echo";
+import * as feedback_widget from "./feedback_widget";
 import * as giphy from "./giphy";
+import * as hash_util from "./hash_util";
 import {$t, $t_html} from "./i18n";
 import * as keydown_util from "./keydown_util";
 import * as loading from "./loading";
@@ -41,6 +44,7 @@ import * as settings_data from "./settings_data";
 import {current_user, realm} from "./state_data";
 import * as stream_data from "./stream_data";
 import * as stream_topic_history from "./stream_topic_history";
+import * as sub_store from "./sub_store";
 import * as timerender from "./timerender";
 import * as ui_report from "./ui_report";
 import * as upload from "./upload";
@@ -1280,6 +1284,25 @@ function handle_message_move_failure_due_to_time_limit(xhr, handle_confirm, on_h
     });
 }
 
+function show_message_moved_toast(toast_params) {
+    const new_stream_name = sub_store.maybe_get_stream_name(toast_params.new_stream_id);
+    const stream_topic = `#${new_stream_name} > ${toast_params.new_topic_name}`;
+    const new_location_url = hash_util.by_stream_topic_url(
+        toast_params.new_stream_id,
+        toast_params.new_topic_name,
+    );
+    feedback_widget.show({
+        populate($container) {
+            const widget_body_html = render_message_moved_widget_body({
+                stream_topic,
+                new_location_url,
+            });
+            $container.html(widget_body_html);
+        },
+        title_text: $t({defaultMessage: "Message moved"}),
+    });
+}
+
 export function move_topic_containing_message_to_stream(
     message_id,
     new_stream_id,
@@ -1287,6 +1310,7 @@ export function move_topic_containing_message_to_stream(
     send_notification_to_new_thread,
     send_notification_to_old_thread,
     propagate_mode,
+    toast_params,
 ) {
     function reset_modal_ui() {
         currently_topic_editing_messages = currently_topic_editing_messages.filter(
@@ -1320,6 +1344,9 @@ export function move_topic_containing_message_to_stream(
             // from server_events.js.
             reset_modal_ui();
             dialog_widget.close();
+            if (toast_params) {
+                show_message_moved_toast(toast_params);
+            }
         },
         error(xhr) {
             reset_modal_ui();

web/src/stream_popover.js

@@ -397,7 +397,7 @@ export async function build_move_topic_to_stream_popover(
     function move_topic() {
         const params = get_params_from_form();
 
-        const {old_topic_name} = params;
+        const old_topic_name = params.old_topic_name.trim();
         let select_stream_id;
         if (only_topic_edit) {
             select_stream_id = undefined;
@@ -421,7 +421,7 @@ export async function build_move_topic_to_stream_popover(
             // user does not have permission to edit topic.
             new_topic_name = new_topic_name.trim();
         }
-        if (old_topic_name.trim() === new_topic_name) {
+        if (old_topic_name === new_topic_name) {
             // We use `undefined` to tell the server that
             // there has been no change in the topic name.
             new_topic_name = undefined;
@@ -440,6 +440,13 @@ export async function build_move_topic_to_stream_popover(
             // We already have the message_id here which means that modal is opened using
             // message popover.
             propagate_mode = $("#move_topic_modal select.message_edit_topic_propagate").val();
+            const toast_params =
+                propagate_mode === "change_one"
+                    ? {
+                          new_stream_id: select_stream_id || current_stream_id,
+                          new_topic_name: new_topic_name ?? old_topic_name,
+                      }
+                    : undefined;
             message_edit.move_topic_containing_message_to_stream(
                 message.id,
                 select_stream_id,
@@ -447,6 +454,7 @@ export async function build_move_topic_to_stream_popover(
                 send_notification_to_new_thread,
                 send_notification_to_old_thread,
                 propagate_mode,
+                toast_params,
             );
             return;
         }

web/templates/message_moved_widget_body.hbs

@@ -0,0 +1,6 @@
+<div>
+    {{#tr}}
+    Message moved to <z-link>{stream_topic}</z-link>.
+    {{#*inline "z-link"}}<a href="{{new_location_url}}">{{> @partial-block}}</a>{{/inline}}
+    {{/tr}}
+</div>