A page is 20 rows and the index wrapped modulo one less than the row
count, so the last row was unreachable by paging, 21-row and 5-row tables
did nothing on page down from the first row, and 4-row tables cycled
0, 2, 1 and never reached row 3. Page down now clamps to the last row and
page up clamps to the first.
With no division left, a single-row table is safe, so the early return
only guards the empty table again, matching scroll_to_top and
scroll_to_bottom.
handler_proptest.rs was committed without ever being declared as a module, and it imported a list_size strategy that did not exist, so it never compiled. The proptest recipe filtered on a test name substring that matched no test.
Declare the module, add the two strategies it needs, and pass both property test filters to libtest so the recipe runs the ui and handler property tests.
Dark-Alex-17