Merge change 1463 into donut

* changes:
  Fixes #1846038. DrawableContainer was wrongly returning its opacity by ignoring the visibility of the currently selected layer. This change simply reports a TRANSPARENT opacity if there is no currently selected layer of if the selected layer is not visible. Otherwise it reports the opacity computed by the state class.
tree: 7397a7b18c5731e1350f15ff9e9855443261b8d5
  1. awt/
  2. camera/
  3. cmds/
  4. im/
  5. include/
  6. libs/
  7. opengl/
  8. MODULE_LICENSE_APACHE2
  9. NOTICE