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The fmt::format() function looks for the "{arg}" named argument in the given "format" string which does not exist. It will fail if the string contains any {...} curled-brace substring. Consequently, any "on-click*" option's command line containing for instance substring like "${var}" or "awk '{...}'" will crash the program. Signed-off-by: Thomas Venriès <thomas.venries@gmail.com>