[FIX] web: display Warning if "Save & Close"

When a warning is triggered by an onchange, clicking on "Save & Close"
will cause the warning to be closed as soon as it is shown. This fix
prevents the saving and closing if a warning message is detected.

opw-653503

addons/web/static/src/js/views/form_common.js

@@ -868,11 +868,15 @@ var FormViewDialog = ViewDialog.extend({
 
             if(!readonly) {
                 options.buttons.splice(0, 0, {text: _t("Save") + ((multi_select)? _t(" & Close") : ""), classes: "btn-primary o_formdialog_save", click: function() { // o_formdialog_save class for web_tests!
-                        $.when(self.view_form.save()).done(function() {
-                            self.view_form.reload_mutex.exec(function() {
-                                self.trigger('record_saved');
-                                self.close();
-                            });
+                        self.view_form.onchanges_mutex.def.then(function() {
+                            if (!self.view_form.warning_displayed) {
+                                $.when(self.view_form.save()).done(function() {
+                                    self.view_form.reload_mutex.exec(function() {
+                                        self.trigger('record_saved');
+                                        self.close();
+                                    });
+                                });
+                            }
                         });
                     }
                 });

addons/web/static/src/js/views/form_view.js

@@ -589,11 +589,16 @@ var FormView = View.extend(common.FieldManagerMixin, {
         }
         // FIXME XXX a list of warnings?
         if (!_.isEmpty(result.warning)) {
-            new Dialog(this, {
+            this.warning_displayed = true;
+            var dialog = new Dialog(this, {
                 size: 'medium',
                 title:result.warning.title,
                 $content: QWeb.render("CrashManager.warning", result.warning)
-            }).open();
+            });
+            dialog.open();
+            dialog.on('closed', this, function () {
+                this.warning_displayed = false;
+            });
         }
 
         return $.Deferred().resolve();