Because of a missing "invalidate()" call (removed in the review of the recently PR) scrollbars are not rendered when the fadeScrollbars attribute is set to false.

This only applies to the ZoomLayout, the ZoomImageView is not affected, apparently because it uses setImageMatrix() which internally calls invalidate() on every draw.

I would just follow the documentation and call invalidate if awakenScrollbars() returns false.

I will create a PR for this issue shortly.