looking at the hints, the deafult shortcuts ALT+left and ALT+right moves the timeline ruler (or cursor) to next/previous SNAP POINT

on 19.08 i used these keys to move from beginning to end of every clip (and viceversa) .. i placed also these functions on my jog shuttle to speed up moving on timeline.

on 20.04 these keys are moving only on some points (that i can't understand why are marked as SNAP POINTS)

my question is ... what is exactly a SNAP point? it's necessary to open an issue about this? or there is another command to move cursor left and right to nearest clip?