Expand/collapse close & backlog lists in issue boards

The closed & backlog lists in issue boards are no collapsible. They can
be collapsed independently of each other & this selection is then saved
to the browser through localStorage. When the page loads, the code gets
the data from localStorage & determines whether to show or hide the list

Closes #23917

1 files changed, 3 insertions, 1 deletions

diff --git a/app/assets/javascripts/boards/models/list.js b/app/assets/javascripts/boards/models/list.js
index 90561d0f7a8..3591b2917d8 100644
--- a/app/assets/javascripts/boards/models/list.js
+++ b/app/assets/javascripts/boards/models/list.js
@@ -12,7 +12,9 @@ class List {
     this.position = obj.position;
     this.title = obj.title;
     this.type = obj.list_type;
-    this.preset = ['closed', 'blank'].indexOf(this.type) > -1;
+    this.preset = ['backlog', 'closed', 'blank'].indexOf(this.type) > -1;
+    this.isExpandable = ['backlog', 'closed'].indexOf(this.type) > -1;
+    this.isExpanded = true;
     this.page = 1;
     this.loading = true;
     this.loadingMore = false;