Instantiate always Screen for xxx2Many fields with the same parameters

The screen must be instantiated with the context of the parent screen so
eventual field_view_get would give the same result.
The limit must always be set to None/null to ensure to load all the records.
The breadcrumb must be set to show navigation to the user.

Closes #3140

sao/src/view/form.js

@@ -3231,6 +3231,7 @@ function eval_pyson(value){
                 row_activate: this.activate.bind(this),
                 exclude_field: attributes.relation_field || null,
                 limit: null,
+                context: this.view.screen.context,
                 pre_validate: attributes.pre_validate,
                 breadcrumb: breadcrumb,
             });
@@ -3812,6 +3813,7 @@ function eval_pyson(value){
                 row_activate: this.activate.bind(this),
                 readonly: true,
                 limit: null,
+                context: this.view.screen.context,
                 breadcrumb: breadcrumb,
             });
             this.screen.windows.push(this);
@@ -3986,12 +3988,16 @@ function eval_pyson(value){
                 // Remove the first tree view as mode is form only
                 view_ids.shift();
             }
-            return new Sao.Screen(this.attributes.relation, {
+            var model = this.attributes.relation;
+            var breadcrumb = jQuery.extend([], this.view.screen.breadcrumb);
+            breadcrumb.push(this.attributes.string || Sao.common.MODELNAME.get(model));
+            return new Sao.Screen(model, {
                 'domain': domain,
                 'view_ids': view_ids,
                 'mode': ['form'],
                 'views_preload': this.attributes.views,
-                'context': context
+                'context': context,
+                'breadcrumb': breadcrumb,
             });
         },
         edit: function() {

tryton/tryton/gui/window/view_form/view/form_gtk/many2many.py

@@ -90,13 +90,19 @@ class Many2Many(Widget):
         frame.set_shadow_type(Gtk.ShadowType.OUT)
         vbox.pack_start(frame, expand=False, fill=True, padding=0)
 
-        self.screen = Screen(attrs['relation'],
+        model = attrs['relation']
+        breadcrumb = list(self.view.screen.breadcrumb)
+        breadcrumb.append(
+            attrs.get('string') or common.MODELNAME.get(model))
+        self.screen = Screen(model,
             view_ids=attrs.get('view_ids', '').split(','),
             mode=['tree'], views_preload=attrs.get('views', {}),
             order=attrs.get('order'),
             row_activate=self._on_activate,
             readonly=True,
-            limit=None)
+            limit=None,
+            context=self.view.screen.context,
+            breadcrumb=breadcrumb)
         self.screen.windows.append(self)
 
         vbox.pack_start(self.screen.widget, expand=True, fill=True, padding=0)

tryton/tryton/gui/window/view_form/view/form_gtk/one2many.py

@@ -168,6 +168,7 @@ class One2Many(Widget):
             row_activate=self._on_activate,
             exclude_field=attrs.get('relation_field', None),
             limit=None,
+            context=self.view.screen.context,
             breadcrumb=breadcrumb)
         self.screen.pre_validate = bool(int(attrs.get('pre_validate', 0)))
         self.screen.windows.append(self)

tryton/tryton/gui/window/view_form/view/list_gtk/widget.py

@@ -998,6 +998,8 @@ class O2M(GenericText):
         screen = Screen(relation, mode=['tree', 'form'],
             view_ids=self.attrs.get('view_ids', '').split(','),
             exclude_field=field.attrs.get('relation_field'),
+            limit=None,
+            context=self.view.screen.context,
             breadcrumb=breadcrumb)
         screen.pre_validate = bool(int(self.attrs.get('pre_validate', 0)))
         screen.group = group
@@ -1024,6 +1026,8 @@ class M2M(O2M):
         screen = Screen(relation, mode=['tree', 'form'],
             view_ids=self.attrs.get('view_ids', '').split(','),
             exclude_field=field.attrs.get('relation_field'),
+            limit=None,
+            context=self.view.screen.context,
             breadcrumb=breadcrumb)
         screen.group = group