feat(AutoFill): auto select when item length equal 1 (#6947)

* AutoFill组件变动

input输入Enter时，如候选项唯一，直接选中
当焦点从AutoFill移出时，如GetDisplayText(Value)对应的内容与input中的内容不符则清空Value和Input

* Modify Enter key handling in AutoComplete component

Signed-off-by: braia123 <guanxin_11@126.com>

* refactor: 代码重构

* refactor: 移除 onblur 回调

* revert: 撤销清空逻辑

* revert: 撤销 js 方法

---------

Signed-off-by: braia123 <guanxin_11@126.com>
Co-authored-by: Argo Zhang <argo@live.ca>

Author: braia123

src/BootstrapBlazor/Components/AutoComplete/AutoComplete.razor.js

@@ -153,9 +153,16 @@ const handlerKeydown = (ac, e) => {
     if (key === 'Enter') {
         const skipEnter = el.getAttribute('data-bb-skip-enter') === 'true';
         if (!skipEnter) {
-            const current = menu.querySelector('.active');
-            if (current !== null) {
-                current.click();
+            const items = [...menu.querySelectorAll('.dropdown-item')];
+            if (items.length === 1) {
+                const item = items[0];
+                item.click();
+            }
+            else {
+                const current = menu.querySelector('.active');
+                if (current !== null) {
+                    current.click();
+                }
             }
             invoke.invokeMethodAsync('EnterCallback');
         }