When in a non unicode locale, concurrent-output cannot be used. When -J is used, and there are progress meters displayed, this leads to the meters being written at whatever the current cursor position happens to be, which messes up the display.

It might be best to fix this by just not displaying progress meters when in a non-unicode locale and when -J is used. That was the approach taken in 0f18636c8a85526259e9d75f6164c66edbca676b. --Joey

[done]]