Previously, we manually synchronized the keyboard state in response to
tap events, but this meant that several common cases were unreliable.

Now, we use GPUI's focused element as the source of truth, and use
`sync_virtual_keyboard` in cases where they have gotten out of sync
(i.e. a user manually dismisses a keyboard while the input is still
focused).

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Release Notes:

- N/A or Added/Fixed/Improved ...