[FIX] web: usable *_activity widget in many2many subview

Example of steps:
	- Install `web_studio`
	- add a `many2many` field from res.partner
	- create a record
	- add a line by selecting a partner

In this case `_parseServerValue` will crash

https://github.com/odoo/odoo/blob/29d55e44035b6e6c6aba6fa4a114d555a766b7c7/addons/web/static/src/legacy/js/views/abstract_model.js#L101-L111

Because `field.selection` is undefined
this code is getting field from this line

https://github.com/odoo/odoo/blob/d3ef5891e8e92636dd61b8f2b7186ad139e8b42a/addons/mail/static/src/web/fields/kanban_activity/kanban_activity.js#L14
Instead of specifying `selection: []` in the fieldDependencies
this pr fixes this issue generally and prevents these kind
of fixes https://github.com/odoo/odoo/pull/125052

opw-3671417

closes odoo/odoo#150445

X-original-commit: 139e107a58ff4be4f03a57df07806355cb7d6236
Signed-off-by: Lucas Perais (lpe) <lpe@odoo.com>

addons/web/static/src/model/relational_model/utils.js

@@ -65,13 +65,17 @@ export function addFieldDependencies(activeFields, fields, fieldDependencies = [
             activeFields[field.name] = makeActiveField(field);
         }
         if (!fields[field.name]) {
-            fields[field.name] = omit(field, [
+            const newField = omit(field, [
                 "context",
                 "invisible",
                 "required",
                 "readonly",
                 "onChange",
             ]);
+            fields[field.name] = newField;
+            if (newField.type === "selection" && !Array.isArray(newField.selection)) {
+                newField.selection = [];
+            }
         }
     }
 }

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

@@ -765,6 +765,60 @@ QUnit.module("Views", (hooks) => {
         assert.containsOnce(target, ".modal .o_form_view .o_field_widget[name=p]");
     });
 
+    QUnit.test(
+        "form with o2m having a selection field with fieldDependencies",
+        async function (assert) {
+            class MyField extends CharField {}
+            fieldRegistry.add("my_widget", {
+                component: MyField,
+                fieldDependencies: [{ name: "selection", type: "selection" }],
+            });
+
+            serverData.models.partner.fields.o2m = { type: "one2many", relation: "partner_type" };
+            serverData.models.partner.records[1].o2m = [];
+            serverData.views = {
+                "partner_type,false,form": `<form><field name="display_name" /></form>`,
+            };
+
+            serverData.models.partner_type.fields.selection = {
+                type: "selection",
+                selection: [
+                    ["a", "A"],
+                    ["b", "B"],
+                ],
+            };
+            serverData.models.partner_type.records = [
+                {
+                    id: 1,
+                    display_name: "first partner_type",
+                    selection: false,
+                },
+            ];
+
+            serverData.models.partner.records[1].o2m = [1];
+            await makeView({
+                type: "form",
+                resModel: "partner",
+                serverData,
+                arch: `
+                <form>
+                    <field name="o2m">
+                        <tree>
+                            <field name="display_name" widget="my_widget"/>
+                        </tree>
+                    </field>
+                </form>`,
+                resId: 2,
+            });
+
+            assert.containsOnce(target, ".o_field_widget[name=o2m] .o_data_row");
+            await click(
+                target.querySelector(".o_field_widget[name=o2m] .o_field_x2many_list_row_add a")
+            );
+            assert.containsOnce(target, ".modal .o_form_view .o_field_widget[name=display_name]");
+        }
+    );
+
     QUnit.test("fieldDependencies are readonly by default", async function (assert) {
         class MyField extends CharField {}
         fieldRegistry.add("my_widget", {