Fixed in tool scroll list
Fixed in tool scroll list

Reversion of an older bug - you could scroll past the end
of the tool list, into an infinte number of blank pages.

Page-down button now correctly hides itself if there
are no more pages to view.

Change-Id: I1650b3fb317b69df60398c05b027ff2ef93e4287

google/mechahamster,google/mechahamster