Adding a button for toggling nested items in activecollab

This is a follow up to Bookmarklets for expanding, collapsing items in activeCollab.

I hacked the activeCollab Checklist module last night. Specifically the ChecklistsController.class.php file, adding the links to toggle the nested items.

Here’s the new button:

Here it is expanded:

I briefly looked at creating a module to override the checklist controller module but wasn’t able to make any headway there so I created a patch: ChecklistsController.class.php_toggle_nested_items_5-5-11_v0.2.patch.