Red label highlight not extinguished upon hover-out in fitted label mode

[Robert Leach]

When the labels fit the matrix scale (i.e. when the labels are black), the hover label (colored red) keeps up as long as the cursor continuously moves, but once the cursor stops, the red highlight freezes in place. We should either not highlight any hovered labels red when the cursor is not hovering over an appropriate pane, or we should live-update the labels all the time, even if the cursor is hovered off the app.

The same is true of the bold red tree branch highlight and light blue tree area corresponding to labels highlight.

[Robert Leach]

Here's an example. The cursor in this example is not even over the TreeView window, nor does it's position correspond to what is red/highlighted.

[Robert Leach]

Resolved on branch issue276.

[Robert Leach]

Removing milestone: Navigation (automated comment)