IgniteUI / igniteui-angular / 31495047881

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fix(grid): restore trailing scroll emission so top rows aren't lost after fast scroll - 22.0.x (#17459)

* fix(grid): ensure final settle position in momentum scroll with trailing option

* test(grid): add regression coverage for momentum-scroll trailing settle

Drives the vertical scrollNotify stream with an intermediate (leading-edge)
position followed by a scrollTop=0 settle in the same throttle window, so the
settle can only be delivered on the trailing edge. Asserts the grid resets to
startIndex 0 / renders row 0, guarding against the dropped-trailing throttle
config that left the top rows frozen out of view.

* test(grid): sync throttle-trailing test with review updates

Match the base-branch test: place under the virtualization tests, use a
fixture that overflows horizontally (30 columns) with an overflow assertion,
and add the bottom-boundary case (#17464).

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