flickery when updated quickly

[joeyh]

loop = tick pg >> threadDelay 100 >> loop

This causes quite a lot of flicker in the display of the progress bar. It's being updated 1000 times a second.

It should help to avoid updating the progress bar if the rendered progress bar looks identical to how it did before. Then if only a bar and percent is being displayed, most redisplays will be avoided. This also helps in low-bandwidth situations.

If :current is in the format string though, that won't work, it will display differently every time.

The best fix would probably be to avoid updating the progress bar more than N times a second. This is what other progress bars I've seen do.