[FIX] web: open record from list with a x2m field on virtual record

To reproduce
============
- On a project, on a task
- create a subtask give it a name and from the list view click on the
  "view" button
- you get redirected to form view to create a new task that is not related
to the parent task or the project

Problem
=======
When you click on the "view" button, the task is not saved yet, so the
subtask doesn't exist yet to be viewed in Form view

Solution
========
We prevent the redirection to the form view if the record is not saved yet
same logic as : https://github.com/odoo/odoo/commit/9b136383c2599301413e6770cc0ff204273b589d

opw-3681471

closes odoo/odoo#149753

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

addons/web/static/src/views/list/list_renderer.xml

@@ -272,7 +272,7 @@
             <t t-if="props.onOpenFormView">
                 <td class="o_list_record_open_form_view text-center"
                     t-on-keydown="(ev) => this.onCellKeydown(ev, group, record)"
-                    t-on-click.stop="() => props.onOpenFormView(record)"
+                    t-on-click.stop="() => isX2Many and record.isNew ? this.displaySaveNotification() : props.onOpenFormView(record)"
                     tabindex="-1"
                 >
                     <button class="btn btn-link text-end"

addons/web/static/tests/views/form/form_view_tests.js

@@ -13636,6 +13636,34 @@ QUnit.module("Views", (hooks) => {
         }
     );
 
+    QUnit.test(
+        "open form view action in x2many should display a notification if the record is virtual",
+        async (assert) => {
+            const notificationService = makeFakeNotificationService((msg, options) => {
+                assert.step(`${options.type}:${msg}`);
+            });
+            registry.category("services").add("notification", notificationService, { force: true });
+
+            await makeView({
+                type: "form",
+                resModel: "partner",
+                serverData,
+                arch: `
+                <form>
+                    <field name="p">
+                        <tree editable="bottom" open_form_view="1">
+                            <field name="foo"/>
+                        </tree>
+                    </field>
+                </form>`,
+            });
+
+            await click(target.querySelector(".o_field_one2many .o_field_x2many_list_row_add a"));
+            await click(target.querySelector(".o_list_record_open_form_view"));
+            assert.verifySteps(['danger:Please click on the "save" button first']);
+        }
+    );
+
     QUnit.test("prevent recreating a deleted record", async (assert) => {
         serverData.models.partner.records.length = 1;