[abo3losh1]

For a bar of unknown length, GetMax and GetMax64 return the bar width, while State().Max says -1:

bar := progressbar.NewOptions(-1)
bar.GetMax()     // 40
bar.State().Max  // -1

progressbar.Default(-1).GetMax() // 10, its width

bar = progressbar.NewOptions(100)
bar.ChangeMax(-1)
bar.GetMax()     // 40

lengthUnknown() stores config.width in config.max so the spinner can use it, and the getters return that field as is. State() already checks ignoreLength and reports -1, so this makes GetMax64 do the same, and GetMax now calls GetMax64. Nothing inside the package calls the getters, so rendering is unchanged.

Added TestGetMaxUnknownLength, covering NewOptions(-1) and ChangeMax(-1) / ChangeMax(50). It fails before the change with GetMax() = 40, want -1. The rest of the suite is unchanged. On Windows, TestSpinnerClearOnFinish fails both with and without this change.

Related, but left out on purpose: AddMax on an unknown-length bar adds to the width (NewOptions(-1).AddMax(100) gives a max of 140), and its if p.config.max == -1 check never matches. It's not obvious what the right result is there, so I can do that as a follow-up if you want.

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