Add pane with focus tree #1
Description
Add a pane to left side of the screen that shows the focus tree in a tree menu.
Highlight the currently focused widget. Animate a fade out when a widget loses focus. Animate a flash effect when a new widget gains focus.
Provide a button or mechanism to show/hide the pane.
Include toggle to auto-scroll to the newly focused widget (or not).
Let the user adjust the font size to be able to fit more of the tree in the available space, when needed.
Integrate with the history pane such that these panes can be combined, both into a single pane on one side of the screen.