fix: duplicate rendering of extra empty lines

[tukaelu]

Hi, @schollz

As I commented in Issue #97, the implementation that clears the current line fills too much extra space for the width of the terminal, and some terminal software makes it look as if the line is broken.

The reason is that in the current implementation s.maxLineWidth keeps increasing and exceeds the width of the terminal.

progressbar/progressbar.go

Line 990 in 3d12297

str := fmt.Sprintf("\r%s\r", strings.Repeat(" ", s.maxLineWidth))

I think that filling the space with the width of the terminal would probably solve the problem you are having, but could you please confirm this?

screenshots📸

before

If go run examples/basic on the master branch, it will look like this.

after

This PR solves this problem.

[tukaelu]

This PR has been found to be a problem and is closed.