[FIX] web: allow date to be validated through the ENTER keyboard

When creating a custom datetime field (with date option type) with Studio and
that you edit the field manually then validates with the ENTER keyboard, the
date is changed (one day is removed - mm/dd-1/yy).
Since [1].

Step to reproduce the issue:
1. Put yourself in Europe timezone (e.g. BE)
2. Add a datetime field via studio (e.g. on the product form)
3. Put a date widget (no datetime)
4. Enter a date manually mm/dd/yy
5. Hit ENTER without clicking outside the box
You will see that the final date will be mm/dd-1/yy.

Solution: The path applied when clicking outside the box and cliking ENTER is
not the same. In the ENTER path, we check if the type of the field is a
`datetime`, if so, we remove the offset TZ to match 00:00:00 instead of
02:00:00 (if you were in GMT+2 zone). The issue is that we do this offset
if the customm field (via Studio) is a `datetime`. This check is incorrect: we
can have a `datetime` field but a date widget, in that case, if we are not on
GMT time we offset by some hours and we end up the day before (as we offset by
2 hours starting from midnight which results in 22PM the day before and when
rendered as a simple date we "loose" one day).

[1]: https://github.com/odoo/odoo/commit/08a423577f732b65ad5035e8f4662386a8631c5f

opw-2830843

closes odoo/odoo#93293

X-original-commit: 37a58832bc966f28fb2c1d627dfe28cef4fb5de7
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>
Signed-off-by: Desausoi Laurent (lade) <lade@odoo.com>

addons/web/static/src/legacy/js/fields/basic_fields.js

@@ -1001,7 +1001,7 @@ var FieldDate = InputField.extend({
             let value = this.$input.val();
             try {
                 value = this._parseValue(value);
-                if (this.field.type === "datetime") {
+                if (this.datewidget.type_of_date === "datetime") {
                     value.add(-this.getSession().getTZOffset(value), "minutes");
                 }
             } catch (_err) {}

addons/web/static/tests/legacy/fields/basic_fields_tests.js

@@ -5250,6 +5250,41 @@ QUnit.module('basic_fields', {
         form.destroy();
     });
 
+    QUnit.test('datetime field with date widget: hit enter should update value', async function (assert) {
+        assert.expect(2);
+
+        const form = await createView({
+            View: FormView,
+            model: 'partner',
+            data: this.data,
+            arch:'<form string="Partners"><field name="datetime" widget="date"/></form>',
+            res_id: 1,
+            translateParameters: {  // Avoid issues due to localization formats
+                date_format: '%m/%d/%Y',
+            },
+            viewOptions: {
+                mode: 'edit',
+            },
+            session: {
+                getTZOffset: function () {
+                    return 120;
+                },
+            },
+        });
+
+        const datetime = form.el.querySelector('input[name="datetime"]');
+
+        await testUtils.fields.editInput(datetime, '01/08/22');
+        await testUtils.fields.triggerKeydown(datetime, 'enter');
+        assert.strictEqual(datetime.value, '01/08/2022');
+
+        // Click outside the field to check that the field is not changed
+        await testUtils.dom.click(form.$el);
+        assert.strictEqual(datetime.value, '01/08/2022');
+
+        form.destroy();
+    });
+
     QUnit.module('RemainingDays');
 
     QUnit.test('remaining_days widget on a date field in list view', async function (assert) {