I open the schema explorer, then let's say I don't remember a field name, so I start typing it, like "CommentCount". The schema explorer filters the treeview and I can see the field below the UserFeed object.
Now that I've found it, I want to see the entire UserFeed object, to use other fields or whatever, but if I clear the filter, the schema explorer goes back to the initial state, showing the first objects (Account etc), collapsed. In a very large org, this means the search tool is not usable, because once I found my field, it will take ages to scroll down to the UserFeed object.
I'm not sure whether it's an issue or intentional, anyway I think the clear filter action should not reset the treeview, selection should stay where it is.
Or maybe I'm using it the wrong way. :-)