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现在的命令补全得空格之后才会显示选项框，能否实现历史命令的补全，如下图所示，输入满足历史命令的任一字符就能显示出历史命令，白色的部分是已经输入的，稍微暗淡点颜色的是待补全的部分，按→键盘或自定义键可以完整补全
