[FIX] web: can't save if a o2m line have a modifier and try to read db

When the user click on save, 'is_valid' is called on each field.
The o2m test all sub-field (apply modifier and check value).
But, if a modifier change the read-only attribute, the field is reinitialized and call 'render_value' without check 'no_rerender' value.
The relational fields call the db in render_value, and the x2m is invalid because a request is pending.
(change X2ManyListView to keep the 'no_rerender' initial value)

opw-653120

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

@@ -154,9 +154,11 @@ var ReinitializeWidgetMixin =  {
 var ReinitializeFieldMixin =  _.extend({}, ReinitializeWidgetMixin, {
     reinitialize: function() {
         ReinitializeWidgetMixin.reinitialize.call(this);
-        var res = this.render_value();
-        if (this.view && this.view.render_value_defs){
-            this.view.render_value_defs.push(res);
+        if (!this.no_rerender) {
+            var res = this.render_value();
+            if (this.view && this.view.render_value_defs){
+                this.view.render_value_defs.push(res);
+            }
         }
     },
 });

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

@@ -963,17 +963,15 @@ var X2ManyListView = ListView.extend({
         var current_values = {};
         _.each(fields, function(field){
             field._inhibit_on_change_flag = true;
+            field.__no_rerender = field.no_rerender;
             field.no_rerender = true;
             current_values[field.name] = field.get('value');
         });
         var cached_records = _.filter(this.dataset.cache, function(item){return !_.isEmpty(item.values)});
         var valid = _.every(cached_records, function(record){
             _.each(fields, function(field){
                 var value = record.values[field.name];
-                var tmp = field.no_rerender;
-                field.no_rerender = true;
                 field.set_value(_.isArray(value) && _.isArray(value[0]) ? [COMMANDS.delete_all()].concat(value) : value);
-                field.no_rerender = tmp;
             });
             return _.every(fields, function(field){
                 field.process_modifiers();
@@ -984,7 +982,7 @@ var X2ManyListView = ListView.extend({
         _.each(fields, function(field){
             field.set('value', current_values[field.name], {silent: true});
             field._inhibit_on_change_flag = false;
-            field.no_rerender = false;
+            field.no_rerender = field.__no_rerender;
         });
         return valid;
     },