Audio Editor: Undo and Frozen Selection#413

Issue:
When highlighting a bit of audio for modification and performing the modification; upon using undo feature, the highlighted selection becomes frozen. It can’t be moved or resized and you must start a new highlight selection over.

Expected Behavior:
When modifying a bit of highlight audio, and then using undo feature; the highlighted selection should still be modfiable (move, resize) without having to start a whole new selection.