IdeBackForwardList should remove "current-item" property
@chergert
Submitted by Christian Hergert Link to original bug (#749032)
Description
Currently, IdeBackForwardList tries to maintain a "current-item" that the user is located at (such as a line in the current file). This turned out to not work very well.
We need to remove this property, and simply maintain back and forward queues. We can only ever be "between" the two queues.
Some tests will need to be updated as well.