支持自动补完列表

[StrollStars]

Is your feature request related to a problem? Please describe.
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无关。

Describe the solution you'd like
A clear and concise description of what you want to happen.
当一行行首输入1. 或* 、+ 、- 等符号后，换到下一行后，行首能够自动补完对应的符号。

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.
手动补完。

Additional context
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