.hideAnnotations should not disable annotation creation

[rsimon]

Currently, calling .hideAnnotations will also switch off the ability to create new annotations. It's probably better to change the behavior, so that .hideAnnotations only hides the existing annotations, while annotation creation is still possible.

Controlling of selection functionality would be possible through the .hideSelectionWidget and showSelectionWidget API functions, anyway.

Technical note: due to the way selection activation currently works (i.e. viewCanvas being the mouse-sensitive element), this may imply a non-trivial change in the code. On the other hand, the change would likely simplify the touch compatibility.

[salus-sage]

Hi,

I would like to add that this functionality will enhance user experience, jus in case there are too many annotations on a picture, with an option to clear the slate for writing sounds good to me.