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help: enable auto-wrapping of help output (#9633)
Previously, without the 'wrap_help' feature enabled, Clap would not do any auto-wrapping of help text. For help text with long lines, this tends to lead to non-ideal formatting. It can be especially difficult to read when the width of the terminal is smaller. This commit enables 'wrap_help', which will automatically cause Clap to query the terminal size and wrap according to that. Or, if the terminal size cannot be determined, it will default to a maximum line width of 100. Ref #9599 (comment)
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