On keyboard handling, https://github.com/linebender/druid/issues/1040 is the main tracking issue. That references a number of PR's, of which 1049 is the core of the platform keyboard handling. I'd be very pleased for other people doing this (including winit) to use this as a model, as a fair amount of study went into getting it right, especially on Windows.
Regarding IME, we haven't done it yet (we're trying to be fairly conservative in our roadmapping), but we plan to wire up actual composition regions and so on, and hope to plumb IME to it using a cross-platform abstraction. My understanding of the winit code is that it varies a lot from platform to platform, but seems to mostly be synthesizing keyboard events (ReceivedCharacter) when an IME request such as "insertText" happens.
Regarding IME, we haven't done it yet (we're trying to be fairly conservative in our roadmapping), but we plan to wire up actual composition regions and so on, and hope to plumb IME to it using a cross-platform abstraction. My understanding of the winit code is that it varies a lot from platform to platform, but seems to mostly be synthesizing keyboard events (ReceivedCharacter) when an IME request such as "insertText" happens.