Last modified: 2006-09-05 09:52:39 UTC
When the mouse is over the minus sign, the one that make the subtree collapse, a tag with the content of the system message MediaWiki:categorytree-collapse is displayed (and this seems fine). However when the pointer is on a plus sign, the one that make the subtree collapse, what is displayed is the content of system message MediaWiki:categorytree-load and not the content of the system message MediaWiki:categorytree-expand , which, if I had understood correctly, should be the more appropriate one.
categorytree-load is used if the subcategories of that category have not yet been loaded - i.e. click it would cause a HTTP request (which may take a while). If the subcategories are already loaded but the entriy was collapsed again and now shows the + sign, categorytree-expand is used for it. This is not a bug, it's working as designed. But perhaps it would be better to always use categorytree-expand, since the user doesn't really care if the subcategories have to be loaded first before they are displayed... Marking as enhancement.
Fixed in r16386