[FIX] web: properly handle tab navigation with widgets in edit

Rev. https://github.com/odoo/odoo/commit/c5f8f35747b4ca9633c664d6be74614c5ce22fcd
introduced a regression: the input of widgets 'email' and 'url' was not correctly
focused anymore with tab navigation.

The method `getFocusableElement` on their common parent (`InputField`) has not been
correctly overriden because `_super``was not called in edit mode.

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

@@ -828,7 +828,7 @@ var FieldEmail = InputField.extend({
      * @override
      */
     getFocusableElement: function () {
-        return this.mode === 'readonly' && this.$el || $();
+        return this.mode === 'readonly' ? this.$el : this._super.apply(this, arguments);
     },
 
     //--------------------------------------------------------------------------
@@ -940,7 +940,7 @@ var UrlWidget = InputField.extend({
      * @override
      */
     getFocusableElement: function () {
-        return this.mode === 'readonly' && this.$el || $();
+        return this.mode === 'readonly' ? this.$el : this._super.apply(this, arguments);
     },
 
     //--------------------------------------------------------------------------

addons/web/static/tests/views/form_tests.js

@@ -3244,7 +3244,7 @@ QUnit.module('Views', {
     });
 
     QUnit.test('navigation with tab key in form view', function (assert) {
-        assert.expect(2);
+        assert.expect(3);
 
         var form = createView({
             View: FormView,
@@ -3253,8 +3253,9 @@ QUnit.module('Views', {
             arch: '<form string="Partners">' +
                     '<sheet>' +
                         '<group>' +
-                            '<field name="foo"/>' +
+                            '<field name="foo" widget="email"/>' +
                             '<field name="bar"/>' +
+                            '<field name="display_name" widget="url"/>' +
                         '</group>' +
                     '</sheet>' +
                 '</form>',
@@ -3266,12 +3267,18 @@ QUnit.module('Views', {
 
         // focus first input, trigger tab
         form.$('input[name="foo"]').focus();
+
         form.$('input[name="foo"]').trigger($.Event('keydown', {which: $.ui.keyCode.TAB}));
         assert.ok($.contains(form.$('div[name="bar"]')[0], document.activeElement),
             "bar checkbox should be focused");
 
+        form.$('div[name="bar"]').trigger($.Event('keydown', {which: $.ui.keyCode.TAB}));
+        assert.strictEqual(form.$('input[name="display_name"]')[0], document.activeElement,
+            "display_name should be focused");
+
         // simulate shift+tab on active element
         $(document.activeElement).trigger($.Event('keydown', {which: $.ui.keyCode.TAB, shiftKey: true}));
+        $(document.activeElement).trigger($.Event('keydown', {which: $.ui.keyCode.TAB, shiftKey: true}));
         assert.strictEqual(document.activeElement, form.$('input[name="foo"]')[0],
             "first input should be focused");