Juanjo Tugores 976d528d71 Mark the Flutter Views as focusable by setting a tabindex value. (flutter/engine#50876)
Mark the Flutter View as focusable by setting a tabindex value.

* When a given flutter view is focused its tabindex will be `-1`
* When a given flutter view is not focused its tabindex will be `0`
* When semantics are enabled no tabindex will be set.

Relevant Issues are:

* Design doc: https://flutter.dev/go/focus-management 
* Focus in web multiview: https://github.com/flutter/flutter/issues/137443
* Platform dispatcher changes: https://github.com/flutter/engine/pull/49841

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
2024-03-08 23:36:16 +00:00
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