Suppress click/dblclick events during drag
Suppress click/dblclick events during drag

Similarly to commit f7fbda9a43866a2404d20e5e0f50c55ce72add4c (#312),
which suppressed mousemove/mouseup events, we want to block other
elements’ click/dblclick handlers from firing at the end of a
scrollbar drag.

Signed-off-by: Anders Kaseorg <087231934ba8fcf78bc142ce37d193b895ac03c4@mit.edu>

Grsmto/simplebar,Grsmto/simplebar,Grsmto/simplebar