Save toolbar offset when first entering full screen, the offset in normal mod is the title bar height, which we can get from API
Save toolbar offset when first entering full screen, the offset in normal mod is the title bar height, which we can get from API

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