Korean doesn't work with TSF

[nikitabuyevich]

When TSF is installed/enabled, Korean stops working (The behavior is unexpected and the composition string stops being rendered)

[ryancheung]

I've just #11 , the composition string is empty (filled with some empty characters?). Can you confirm that there's no other issue with Korean IME?
BTW, I've no idea of how Korean IME works.

[nikitabuyevich]

Hey,

So if you just disable TSF (Set TextServicesLoader's ServicesInstalled function to return false, so it fallbacks on IMM32) it behaves correctly/as expected. Essentially the composition is build up and gets automatically inserted on certain criteria.

I don't know Korean either but here's an example you can run to test if it's working properly (Which is how it's currently working with just IMM32)

Spamming a on your keyboard.

1. Type a on your keyboard, the composition should be filled with ㅁ while the text input is empty.
2. Type a on your keyboard again, the composition remains the same character as last time but now the text input should contain ㅁ.
3. If you keep pressing a on your keyboard you'll get the second scenario repeating.

Changing the composition

1. Type a on your keyboard, the composition string should be filled with ㅁ while the text input is empty.
2. Type b on your keyboard, the composition string should change to 뮤 while the text input is empty.
3. Type c on your keyboard, the composition string should change to 뮻 while the text input is empty.
4. Type a on your keyboard, the composition string changes to ㅁ while 뮻 is inserted into the text input.

When I attempt the same scenario with TSF enabled, the composition string is always empty and everything is immediately inserted into the text input. I think what's supposed to happen is that OnEndComposition is called whenever the composition ends (like in scenario 4 when the user typed a and the composition finished building) and only then should the text input be inserted.

I have this project replicated in C++ but I'm getting different behavior where the composition string is being filled up properly but my text input remains empty.

Does that help? Let me know how I can help since I'm kind of stuck on where to take it from here.

[ryancheung]

There's no correct way to fix composion ends on every key press in TSF, I tried.

But, since we have IMM32 works, we could force to IMM32 for Korean IME. This could be a workaround at the moment.
What do you think?

[nikitabuyevich]

Yeah it's a thought I had and something I tried without much success. I've created a new PR (#12) where we can play around with it to toggle it.

The issue is once I unregister and then attempt to register the TSF again, none of the sinks get hit again.

[ryancheung]

I tried with that approach yesterday. It has the issue you put. It seems not possible to be fixed. So I created https://github.com/ryancheung/ImeSharp/tree/option-to-force-disable-tsf

[waltdestler]

Hi, it looks like Korean isn't working regardless of whether TSF is enabled or not. The callbacks sent by ImeSharp do not provide the necessary info to properly update already-entered Korean characters.

As an example, here is the correct sequence of what should happen when pressing the DLEK keys on a keyboard:

D
ㅇ

DL
이

DLE
읻

DLEK
이다

Notice that when the K key is pressed, the previously-entered 읻 (DLE) character reverts to 이 (DL) and then the new character 다 (EK) is appended.

However, ImeSharp reports no change to the 읻 character once K is pressed. Here's the same sequence of keys and the corresponding characters as reported by ImeSharp:

D
ㅇ

DL
이

DLE
읻

DLEK
읻다

This happens regardless of whether tsfForceDisabled is true or not.