Opening a Menu from a TextInput anchor on the web unfocuses the anchor

### Current behaviour
When a Menu has a TextInput as an anchor, if that input's onFocus is used to open the menu, it becomes unfocused.

### Expected behaviour
This is not consistent with Android, where it keeps focus. It would be nice if it worked this way on the web too, so that a searchable dropdown can be implemented.

### Code sample
https://snack.expo.dev/@pta2002/eb79e2

### What have you tried
I have tried using a separate component (not the anchor) to trigger the menu, but it got unfocused as well. Either way, I think the behaviour should at least be consistent.

### Your Environment

| software | version
| --------------------- | -------
| ios or android | Android 11
| react-native | 0.63.2
| react-native-paper | 4.9.2
| node | 14.17.6
| npm or yarn | npm 6.14.15
| expo sdk | 42.0.1

从链接的 Expo Snack 开始，在 Web 上从 TextInput 打开 Menu 时复现焦点丢失。然后追踪 Menu 的锚点和焦点行为，与 Android 进行比较，并验证可搜索的下拉菜单在 Web 上会保持 TextInput 获得焦点。

由索引模型根据 Issue 内容生成。