fix: 修复了tab时无法根据用户设置进行缩进的错误 #39
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当用户键入tab时,若无可接受的补全,理应根据用户设置进行缩进。
但是直接填入\t实际上会破坏用户设置的缩进。用户有可能使用了多个空格来替代一个制表符。
因此,改为使用feedkey填入不同的值。
另外,删除了一些实际上无法用到的返回值