[FIX] web: FormViewDialog: multi select option

Before this rev., the multi_select option wasn't enabled even by setting
disable_multiple_selection to false in the options, when the res_id key
wasn't defined in options (null != undefined). It was the case for every
X2Many views, except for the Many2ManyKanban view as we explicitely set
the disable_multiple_selection to false AND res_id to null. However, all
X2Many views should enable this option.

1 files changed, 2 insertions, 2 deletions

diff --git a/addons/web/static/src/js/views/form_common.js b/addons/web/static/src/js/views/form_common.js
index 5f449c2540e..cd6d061919f 100644
--- a/addons/web/static/src/js/views/form_common.js
+++ b/addons/web/static/src/js/views/form_common.js
@@ -841,8 +841,8 @@ var FormViewDialog = ViewDialog.extend({
     init: function(parent, options) {
         var self = this;
 
-        var multi_select = options.res_id === null && ! options.disable_multiple_selection;
-        var readonly = options.res_id !== null && options.readonly;
+        var multi_select = !_.isNumber(options.res_id) && !options.disable_multiple_selection;
+        var readonly = _.isNumber(options.res_id) && options.readonly;
 
         if(!options || !options.buttons) {
             options = options || {};