IME implementation in WPF

[a-marmer]

IME implementation in WPF which supports Japanese, Chinese, Korean languages.
Instruction how to test install it on Windows 10 https://www.coscom.co.jp/learnjapanese801/msime_win10_en1.html

[amaitland]

Please remove unnessicary unrelated code changes. There are quite a few at first glance.

What versions of Windows have you tested on?

[a-marmer]

Which are the unrelated code changes?
It is tested on Windows 7, Windows 10.

[amaitland]

Comments inline, please review and fix.

[amaitland]

@a-marmer View your proposed changes using the Files Changed tab above, aka https://github.com/cefsharp/CefSharp/pull/2749/files

[amaitland]

Has this been tested on HighDPI displays?

Initially will need to split this out into it's own keyboard handler so it's optional. If that's sorted in the next day or two it can be inclu7in the 73 release for people to test.

Personally IME is not something I'm familiar with, nor do I have a requirement for using it.

[AppVeyorBot]

❌ Build CefSharp 74.1.130-CI3081 failed (commit dca5e407fb by @a-marmer)

[AppVeyorBot]

❌ Build CefSharp 74.1.130-CI3089 failed (commit 5f38407b79 by @a-marmer)

[AppVeyorBot]

❌ Build CefSharp 74.1.130-CI3090 failed (commit 4e59475642 by @a-marmer)

[AppVeyorBot]

❌ Build CefSharp 74.1.130-CI3091 failed (commit 1c374486bb by @a-marmer)

[a-marmer]

It was tested with HighDPI and it works.. Though if DPI is changed when application is running, PresentationSourceChangedHandler is not always called and then IME window position is not correct.
I tested SystemEvents.DisplaySettingsChanged += OnDisplaySettingsChanged; and OnDisplaySettingsChanged is always called. Maybe to use OnDisplaySettingsChanged?

CefSharp3.sln builds on my machine, it is not clear why build fails with appveyor, do you know why?

[AppVeyorBot]

❌ Build CefSharp 74.1.130-CI3092 failed (commit c84e0d7b62 by @a-marmer)

[amaitland]

Inline functions are not supported by the default compiler used with VS2015

[AppVeyorBot]

✅ Build CefSharp 74.1.130-CI3093 completed (commit 4675ac29b0 by @a-marmer)

[amaitland]

Lots of issues remain unresolved, new ones added.

[AppVeyorBot]

✅ Build CefSharp 74.1.130-CI3097 completed (commit d8e3c4e759 by @a-marmer)

[amaitland]

I've taken your PR and squashed it into 840af40

I've restructured things in 6ed722a you can review and comment here. I haven't had time to test anything. Code is now self contained, it's in the Experimental namespace as I'm not really comfortable with the code as a whole, you are unable to explain key sections which obviously isn't your fault, as I don't know what they do it's hard to give the stamp of approval. Everything is fairly consistent at least now.

[amaitland]

This was effectively merged in #2757

There has been some follow up in the form of #2782

If further changes are required then please submit a followup PR, thanks 👍