feat(AutoComplete): DisplayCount Parameter only working when the input gets Onfocus

[mrtonyguo]

Is there an existing issue for this?

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

Steps :
复现步骤:

1. Setting the Parameter of AutoComplete.razor, DisplayCount = "20";

   设置自动完成框显示的数据数量, 20或者其他；

3. If setting the OnFocusFilter = "true", the DisplayCount will be working;

   如果设置了 OnFocusFilter 为true，下拉框显示的数据数量正常;

4. The default OnFocusFilter is false, if no setting of OnFocusFilter in the AutoComplate.razor, the whole Items will be shown, the DisplayCount function is not working;

   OnFocusFilter的默认值为False，如果AutoComplete的没有设置OnFocusFilter为True，下拉框会显示所有的数据，DisplayCount功能没生效;

Tips:
The AutoComplate.razor used the @key to enhance the Rendering Performance, suggest for the @bind-Value List must be disinct.

自动完成框组件使用了@key提高渲染性能，绑定的字符串列表必须是不重复的字符，可以使用DISTINCT”，用于返回唯一不重复的结果集;

Describe the solution you'd like

Add the condition judgement to the OnFocus Method:

是否可以在OnFocus的方法内加上对于DisplayCount的一个判定;

Additional context

No response

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