ehtick / igniteui-webcomponents / 36613256688

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fix(virtual-scroll): align scrollToIndex with measured and compressed items (#2410)

layoutComplete resolved before the ResizeObserver measured the rendered
items, because a frame runs its animation frame callbacks first. So
scrollToIndex stopped its correction early. Wait for a task after each
frame, and settle only after a frame with no render.

Under coordinate compression, the ratio of the sizes left the last items
out of reach, and the content moved at DOM scale inside a window, so
items landed tens of pixels off and jumped when the window moved. Map
the scroll ranges onto each other, and move the content on each scroll
while the list is compressed.

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