[IMP] web: list: add expand attrs

When this attribute is set to true on the <tree> root node, in a
grouped list view, first level groups are automatically opened.

Part of task 1915702

1 files changed, 4 insertions, 1 deletions

diff --git a/addons/web/static/src/js/views/basic/basic_model.js b/addons/web/static/src/js/views/basic/basic_model.js
index 150b97ff0d8..35435a3e500 100644
--- a/addons/web/static/src/js/views/basic/basic_model.js
+++ b/addons/web/static/src/js/views/basic/basic_model.js
@@ -4323,8 +4323,11 @@ var BasicModel = AbstractModel.extend({
                         self.localData[newGroup.id] = newGroup;
                     } else if (!newGroup.openGroupByDefault || openGroupCount >= self.OPEN_GROUP_LIMIT) {
                         newGroup.isOpen = false;
+                    } else if ('__fold' in group) {
+                        newGroup.isOpen = !group.__fold;
                     } else {
-                        newGroup.isOpen = '__fold' in group ? !group.__fold : true;
+                        // open the group iff it is a first level group
+                        newGroup.isOpen = !self.localData[newGroup.parentID].parentID;
                     }
                     list.data.push(newGroup.id);
                     list.count += newGroup.count;