-- map tools to stylus buttons (maybe: btn click on toolbar item affects
- the corresponding tool; tool switching cleaner than for eraser)
-- move selection to another page by drag-drop
- (should apply to vertspacer when origin moves to another page,
- but in the up direction only do so when all the stuff fits on prev page)
- (SEE ALSO FEATURE REQUEST 1472482 and reply to it - optional behavior too?)