[FIX] im_livechat, mail: fix add member to livechat channel

Before this commit, inviting a partner to a livechat channel
had no effect. This commit solves this issue.

Steps to reproduce:
- Go to a livechat channel in the discuss app
- Click on invite a member on the top right corner
- Select a member
- Click on the invite button
- Nothing happens

closes odoo/odoo#128173

X-original-commit: 94086d9289222008f59a97611a80de4e1310e41c
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>
Signed-off-by: Matthieu Stockbauer (tsm) <tsm@odoo.com>

addons/im_livechat/static/tests/channel_invite_tests.js

@@ -0,0 +1,34 @@
+/* @odoo-module */
+
+import { startServer } from "@bus/../tests/helpers/mock_python_environment";
+
+import { Command } from "@mail/../tests/helpers/command";
+import { click, start } from "@mail/../tests/helpers/test_utils";
+
+QUnit.module("Channel invite");
+
+QUnit.test("Can invite a partner to a livechat channel", async (assert) => {
+    const pyEnv = await startServer();
+    const userId = pyEnv["res.users"].create({ name: "James" });
+    pyEnv["res.partner"].create({
+        name: "James",
+        user_ids: [userId],
+    });
+    const channelId = pyEnv["discuss.channel"].create({
+        anonymous_name: "Visitor 20",
+        name: "Visitor 20",
+        channel_member_ids: [
+            Command.create({ partner_id: pyEnv.currentPartnerId }),
+            Command.create({ partner_id: pyEnv.publicPartnerId }),
+        ],
+        channel_type: "livechat",
+        livechat_operator_id: pyEnv.currentPartnerId,
+    });
+    const { openDiscuss } = await start();
+    await openDiscuss(channelId);
+    await click("button[title='Add Users']");
+    await click(".o-discuss-ChannelInvitation-selectable:contains(James) input");
+    await click("button:contains(Invite)");
+    await click("button[title='Show Member List']");
+    assert.containsOnce($, ".o-discuss-ChannelMember:contains(James)");
+});

addons/mail/static/src/discuss/core/common/channel_invitation.js

@@ -105,7 +105,7 @@ export class ChannelInvitation extends Component {
                 ...this.state.selectedPartners.map((partner) => partner.id),
             ];
             await this.threadService.createGroupChat({ partners_to });
-        } else if (["channel", "group"].includes(this.props.thread.type)) {
+        } else {
             await this.messaging.orm.call(
                 "discuss.channel",
                 "add_members",