In WebKit the live cases read the row's top as soon as the list was there,
before the page had followed the newest request and drawn its story above
the list (.rt-log grows 17 → 104px), so the row was 87px lower by the click
and "picking the request moved the page" failed — with the test's own
commit's assets too (d6096e2f), so it is the test's timing, not a
regression. The test now waits for the newest row to be pressed and the
story's steps, then for the row's top to hold still, before clicking.
Before: webkit en/zh live failed 2 of 2 (row 524 → 611). After: 8 of 8
(chromium and webkit, en and zh, live and kept day), three runs.