Martin von Zweigbergk <martinvonz@google.com> [Mon, 22 Apr 2019 22:14:26 -0700] rev 4565
evolve: fix progress display with hg<4.7
Since d1aab9d82f5b (evolve: adapt for deprecated ui.progress(),
2019-01-14), the "item", "units" and "total" are all set to default
values. The last one is especially bad since it results in a "spinner"
instead of a progress bar.