ui: ensure auto-scroll stops correctly near target (#36686)

ensure auto-scroll stops correctly near target

Author: deanlee

system/ui/lib/scroll_panel2.py

@@ -88,6 +88,7 @@ def _update_state(self, bounds_size: float, content_size: float) -> None:
         # Steady once we are close enough to the target
         if abs(dist) < 1 and abs(self._velocity) < MIN_VELOCITY:
           self.set_offset(target)
+          self._velocity = 0.0
           self._state = ScrollState.STEADY
 
       elif abs(self._velocity) < MIN_VELOCITY: