hellohuanlin ab09f653a6 [floating_cursor_selection] a somewhat "design doc" for floating cursor feature (flutter/engine#42173)
This PR gives an overview of how floating cursor feature works (including the new floating cursor selection gesture, and the existing floating cursor move gesture). It can serve as the missing design doc. 

I put it in the engine rather than the framework, since all logics are in one place, and it's closer to the UIKit behavior that I want to cover. 

Thanks @moffatman for helping me understanding it. 

*List which issues are fixed by this PR. You must list at least one issue.*

https://github.com/flutter/flutter/issues/30476

*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
2023-06-12 19:19:54 +00:00
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