[FIX] web: X2m with custom controller

The goal of this commit is to allow an X2m in list mode with a custom
controller to use the controller context when creating a new line with
a 'tab' keydown.

Part-of: odoo/odoo#78221

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

@@ -1138,7 +1138,7 @@ export class ListRenderer extends Component {
                         // add a line
                         if (record.checkValidity()) {
                             const { context } = this.creates[0];
-                            this.props.onAdd(context);
+                            this.props.onAdd({ context });
                         }
                     } else if (
                         activeActions.create &&

addons/web/static/tests/views/fields/one2many_field_tests.js

@@ -9337,6 +9337,45 @@ QUnit.module("Fields", (hooks) => {
         }
     );
 
+    QUnit.test("o2m add a line custom control create editable with 'tab'", async function (assert) {
+        await makeView({
+            type: "form",
+            resModel: "partner",
+            serverData,
+            arch: `
+                <form>
+                    <group>
+                        <field name="turtles">
+                            <tree editable="bottom">
+                                <control>
+                                    <create string="Add soft shell turtle" context="{'default_turtle_foo': 'soft'}"/>
+                                </control>
+                                <field name="turtle_foo"/>
+                                </tree>
+                        </field>
+                    </group>
+                </form>`,
+            resId: 1,
+            mockRPC(route, args) {
+                const { method, kwargs } = args;
+                if (method === "onchange") {
+                    assert.step("onchange");
+                    assert.strictEqual(kwargs.context.default_turtle_foo, "soft");
+                }
+            },
+        });
+        await clickEdit(target);
+
+        await click(target.querySelector(".o_data_row .o_data_cell"));
+        await editInput(target, "[name='turtle_foo'] input", "Test");
+        assert.containsOnce(target, ".o_data_row");
+
+        triggerHotkey("Tab");
+        await nextTick();
+        assert.containsN(target, ".o_data_row", 2);
+        assert.verifySteps(["onchange"]);
+    });
+
     QUnit.test("one2many with onchange, required field, shortcut enter", async function (assert) {
         serverData.models.turtle.onchanges = {
             turtle_foo: function () {},