[FIX] web: keep focus on checkboxes after rerendering

Previously, when a checkbox was re-rendered, it was losing focus
since it was removed and re-created. Now, if the checkbox itself
is the origin point of the re-rendering, we give the focus to the
newly re-rendered checkbox, resulting in a seamless experience
just as if the checkbox was never removed and re-rendered.

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

@@ -613,6 +613,20 @@ var FieldBoolean = AbstractField.extend({
     isSet: function () {
         return true;
     },
+    /**
+     * When the checkbox is rerendered, we need to check if it was the actual
+     * origin of the reset. If it is, we need to activate it back so it looks
+     * like it was not rerendered but is still the same input.
+     *
+     * @override
+     */
+    reset: function (record, event) {
+        var rendered = this._super.apply(this, arguments);
+        if (event && event.target.name === this.name) {
+            this.activate();
+        }
+        return rendered;
+    },
 
     //--------------------------------------------------------------------------
     // Private

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

@@ -123,7 +123,7 @@ QUnit.module('basic_fields', {
     QUnit.module('FieldBoolean');
 
     QUnit.test('boolean field in form view', function (assert) {
-        assert.expect(11);
+        assert.expect(12);
 
         var form = createView({
             View: FormView,
@@ -183,6 +183,12 @@ QUnit.module('basic_fields', {
             .trigger({type: "keyup", which: $.ui.keyCode.ENTER});
         assert.strictEqual(form.$('.o_field_boolean input:checked').length, 1,
             "checkbox should now be checked");
+        // blindly press enter again, it should uncheck the checkbox
+        $(document.activeElement).trigger({type: "keydown", which: $.ui.keyCode.ENTER});
+        assert.strictEqual(form.$('.o_field_boolean input:checked').length, 0,
+            "checkbox should not be checked");
+        // blindly press enter again, it should check the checkbox back
+        $(document.activeElement).trigger({type: "keydown", which: $.ui.keyCode.ENTER});
 
         // save
         form.$buttons.find('.o_form_button_save').click();