TEST-ONLY: set the active tooth (and lazily vivify its state) so a control-revert test can exercise revertActiveControls() against a real active tooth without going through the DOM tooth grid. Not part of the public API.
revertActiveControls()
TEST-ONLY: set the active tooth (and lazily vivify its state) so a control-revert test can exercise
revertActiveControls()against a real active tooth without going through the DOM tooth grid. Not part of the public API.