[FIX] mail: fix reply to author avatar

This PR fixes a bug where the author avatar of the parent message of
a reply had the wrong avatar (the one of the  of the reply
author instead of the one of the parent message author).

closes odoo/odoo#118878

Signed-off-by: Debondt Didier (did) <did@odoo.com>

addons/mail/static/src/core_ui/message_in_reply.js

@@ -26,6 +26,9 @@ export class MessageInReply extends Component {
         ) {
             return url("/mail/static/src/img/email_icon.png");
         }
-        return this.threadService.avatarUrl(this.message.author, this.props.message.originThread);
+        return this.threadService.avatarUrl(
+            this.message.parentMessage.author,
+            this.props.message.parentMessage.originThread
+        );
     }
 }

addons/mail/static/tests/message/message_reply_tests.js

@@ -62,3 +62,31 @@ QUnit.test("click on message in reply to scroll to the parent message", async (a
     await nextTick();
     assert.isVisible($(".o-mail-Message:eq(0)"));
 });
+
+QUnit.test("reply shows correct author avatar", async (assert) => {
+    const pyEnv = await startServer();
+    const channelId = pyEnv["mail.channel"].create({ name: "general" });
+    const messageId = pyEnv["mail.message"].create({
+        body: "Hey there",
+        message_type: "comment",
+        model: "mail.channel",
+        res_id: channelId,
+    });
+    const partnerId = pyEnv["res.partner"].create({ name: "John Doe" });
+    pyEnv["mail.message"].create({
+        body: "Howdy",
+        message_type: "comment",
+        model: "mail.channel",
+        author_id: partnerId,
+        parent_id: messageId,
+        res_id: channelId,
+    });
+    const { openDiscuss } = await start();
+    await openDiscuss(channelId);
+    const replyAvatar = document.querySelector(".o-mail-MessageInReply-avatar");
+    assert.ok(
+        replyAvatar.dataset["src"].includes(
+            `/mail/channel/${channelId}/partner/${pyEnv.currentPartnerId}/avatar_128`
+        )
+    );
+});