Matej Knopp 688a695f2b [web] Ensure handled key event is not propagated to IME (flutter/engine#46829)
Fixes [136460](https://github.com/flutter/flutter/issues/136460)

Changes:
- Raw keyboard event is handled during capture phase. This is to ensure
that the framework processes the event before reaching to IME text area
and raw keyboard can stop the propagation for handled events.
- `RawKeyboard` event handler is invoked from `KeyboardBinding` event
handler. This is to prevent race condition because both handlers now run
in capture phase and `KeyboardBinding` needs to process the event first.

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2023-10-19 00:52:53 +03:00
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