Consideration of proposal to support zoom in/out

[eladalon1983]

If I understood @youennf correctly, he proposes to replace setZoomLevel(value) with zoomIn() and zoomOut(). (Or a similar shape.)

1. Did I understand correctly?
2. What are the benefits of this approach? Could they be articulated by someone who supports that change?
3. Assuming that this approach has some benefits over setZoomLevel(value) in some use cases, could a compromise be achieved, serving both use cases, using either of the following?
   • Specifying both setZoomLevel(value) and zoomIn()/zoomOut()
   • Specifying setZoomLevel() as accepting long or ZoomAction, where ZoomAction is an enum consisting of "in" and "out"

[eladalon1983]

Issue transferred; heads up to those discussion participants who might otherwise be looking for it elsewhere: @jan-ivar, @youennf