When clicking the "Show More" button for the Activity listing, the table momentarily blinks away while the data is loading. This is quite annoying as you lose scroll position and have to start from the top each time.

Repro Steps:

1. Drill into a classic pipeline or freestyle job with at least 25 runs, ideally more than 50.
2. Scroll to the bottom of the page.
3. Click "Show More"

Expected behavior:

• Data is appended to the bottom of the list. The scroll position is preserved.

Actual behavior:

• The entire table disappears, then the screen re-renders with all data. Scroll position is reset to the top.