override keyDown again instead of scrollPageUp/scrollPageDown, apparently Yosemite does not go through these anymore
override keyDown again instead of scrollPageUp/scrollPageDown, apparently Yosemite does not go through these anymore

JackieXie168/skim,JackieXie168/skim,JackieXie168/skim,JackieXie168/skim,JackieXie168/skim