Focus sometimes lost when focus move in the GridView #34153
Description
I am an AndroidTV developer, so it is excited to see that flutter support Focus shifts in different widget.
But it seems to the FocusManager have some problems in the GridView. When using the controller or keyboard to move the focus, the focus sometimes got lost.
Here is a gif example：
GIf is running on macOS, Android also has the same problem when using the remote control
Steps to Reproduce
gif example source code is here : https://github.com/boyan01/flutter_focus_loss
It's easy to reproduce, just press the navigation key to move the focus up and down.
Logs
This is the key log when the focus has been lost，It seems that FocusManager's primary focus does not have an ancestor. maybe this is the cause
flutter: ERR: the focus has been loss
flutter: primary focus：FocusNode#9d55a(context: Focus, FOCUSED)
flutter: primary focus ancestor: ：()
flutter: FocusManager#07390
flutter: │ currentFocus: FocusNode#9d55a
flutter: │
flutter: └─rootScope: FocusScopeNode#96475
flutter: │ debugLabel: "Root Focus Scope"
flutter: │ focusedChild: FocusScopeNode#78b3f
flutter: │
flutter: └─Child 1: FocusScopeNode#78b3f
flutter: │ context: FocusScope
flutter: │ debugLabel: "Navigator Scope"
flutter: │ focusedChild: FocusScopeNode#f41e2
flutter: │
flutter: └─Child 1: FocusScopeNode#f41e2
flutter: │ context: FocusScope
flutter: │ debugLabel: "_ModalScopeState<dynamic> Focus Scope"
flutter: │ focusedChild: FocusScopeNode#9625d
flutter: │
flutter: └─Child 1: FocusScopeNode#9625d
flutter: │ context: FocusScope
flutter: │ focusedChild: FocusNode#107c4
flutter: │
flutter: ├─Child 1: FocusNode#107c4
flutter: │ context: Focus
flutter: │
flutter: ├─Child 2: FocusNode#cab25
flutter: │ context: Focus
flutter: │
flutter: ├─Child 3: FocusNode#7e80d
flutter: │ context: Focus
flutter: │
flutter: ├─Child 4: FocusNode#a2324
flutter: │ context: Focus
flutter: │
flutter: ├─Child 5: FocusNode#16794
flutter: │ context: Focus
flutter: │
flutter: ├─Child 6: FocusNode#96fcd
flutter: │ context: Focus
flutter: │
flutter: ├─Child 7: FocusNode#8aa87
flutter: │ context: Focus
flutter: │
flutter: ├─Child 8: FocusNode#f3cd7
flutter: │ context: Focus
flutter: │
flutter: ├─Child 9: FocusNode#c40c0
flutter: │ context: Focus
flutter: │
flutter: ├─Child 10: FocusNode#3d090
flutter: │ context: Focus
flutter: │
flutter: ├─Child 11: FocusNode#9d015
flutter: │ context: Focus
flutter: │
flutter: ├─Child 12: FocusNode#0ccba
flutter: │ context: Focus
flutter: │
flutter: ├─Child 13: FocusNode#17a06
flutter: │ context: Focus
flutter: │
flutter: ├─Child 14: FocusNode#c7fb3
flutter: │ context: Focus
flutter: │
flutter: ├─Child 15: FocusNode#bc2be
flutter: │ context: Focus
flutter: │
flutter: ├─Child 16: FocusNode#81c77
flutter: │ context: Focus
flutter: │
flutter: ├─Child 17: FocusNode#1bd7d
flutter: │ context: Focus
flutter: │
flutter: ├─Child 18: FocusNode#ba30a
flutter: │ context: Focus
flutter: │
flutter: ├─Child 19: FocusNode#4b07c
flutter: │ context: Focus
flutter: │
flutter: └─Child 20: FocusNode#77eaa
flutter: context: Focus
flutter:
Flutter version
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