[FIX] web: X2Many read propagates field context

Most operations on X2Many widget possibly propagates a field context
(name_create, name_search, ...) but the original read or read on an
onchange does not.

With this changeset, the field context is also used in these instances.

The assertions added in the added test failed with:
  expected: ["world"], result: [undefined]
  expected: ["world","world"], result: [undefined,undefined]

fixes #29203
opw-1914466
closes #29866

2 files changed, 35 insertions, 2 deletions

diff --git a/addons/web/static/src/js/views/basic/basic_model.js b/addons/web/static/src/js/views/basic/basic_model.js
index 418542e062a..1a6e21c4049 100644
--- a/addons/web/static/src/js/views/basic/basic_model.js
+++ b/addons/web/static/src/js/views/basic/basic_model.js
@@ -1701,7 +1701,7 @@ var BasicModel = AbstractModel.extend({
                         model: list.model,
                         method: 'read',
                         args: [_.pluck(data, 'id'), fieldNames],
-                        context: record.context,
+                        context: _.extend({}, record.context, field.context),
                     }).then(function (records) {
                         _.each(records, function (record) {
                             list_records[record.id].data = record;
@@ -2543,7 +2543,7 @@ var BasicModel = AbstractModel.extend({
                 var ids = record.data[fieldName] || [];
                 var list = self._makeDataPoint({
                     count: ids.length,
-                    context: record.context,
+                    context: _.extend({}, record.context, field.context),
                     fieldsInfo: fieldsInfo,
                     fields: view ? view.fields : fieldInfo.relatedFields,
                     limit: fieldInfo.limit,
diff --git a/addons/web/static/tests/fields/relational_fields_tests.js b/addons/web/static/tests/fields/relational_fields_tests.js
index 0a5825850d6..3991d499f3d 100644
--- a/addons/web/static/tests/fields/relational_fields_tests.js
+++ b/addons/web/static/tests/fields/relational_fields_tests.js
@@ -10943,6 +10943,39 @@ QUnit.module('relational_fields', {
         form.destroy();
     });
 
+    QUnit.test('many2many read, field context is properly sent', function (assert) {
+        assert.expect(4);
+
+        this.data.partner.fields.timmy.context = {hello: 'world'};
+        this.data.partner.records[0].timmy = [12];
+
+        var form = createView({
+            View: FormView,
+            model: 'partner',
+            data: this.data,
+            arch: '<form string="Partners">' +
+                    '<field name="timmy" widget="many2many_tags"/>' +
+                '</form>',
+            res_id: 1,
+            mockRPC: function (route, args) {
+                if (args.method === 'read' && args.model === 'partner_type') {
+                    assert.step(args.kwargs.context.hello);
+                }
+                return this._super.apply(this, arguments);
+            },
+        });
+
+        assert.verifySteps(['world']);
+
+        form.$buttons.find('.o_form_button_edit').click();
+        var $m2mInput = form.$('.o_field_many2manytags input');
+        $m2mInput.click();
+        $m2mInput.autocomplete('widget').find('li:first()').click();
+        assert.verifySteps(['world', 'world']);
+
+        form.destroy();
+    });
+
     QUnit.module('FieldStatus');
 
     QUnit.test('static statusbar widget on many2one field', function (assert) {