The card loop fired fixed 100px scroll events back to back with no pauses, which is the jumpy scrolling, and its while-not-in-viewport loop was unbounded, so a card that never fits the viewport completely would hang the run forever. The way back up unwound a counted number of steps, which lands wrong when the page height changes while cards update.
Scrolling is now wheel input with varying step sizes and short pauses, bounded, aimed at centering the target. The return reads the actual scroll position instead of counting.
scrollIntoView re-centered every element unconditionally and instantly, which is the page jump between the daily set and explore on bing. The pointer move now scrolls only when the element is actually outside the viewport, smoothly, and polls the rect until the async scroll settles before computing the path.
Visual search matches the full 'visual search streak' label. Plain 'visual search' can also hit a dashboard element that goes stale mid-interaction, and the guessed 'image search' needle is gone.
The pointer is moved to viewport coordinates, so an element below the fold produced a target outside the window and the driver raised MoveTargetOutOfBoundsException. Observed on the daily set opener during a scheduled run. Also clamps the bezier path to the viewport.
mardausdennis