Unable to type messages, the text deletes itself

[du82]

Steps to reproduce

1. Open any room
2. Type something in the text box (I had to use the rich text editor, the normal one crashes the app entirely)
3. Observe

Notes:

• The text only glitches out if you're sending English characters, it is fine in Chinese
• I cannot use the normal text editor at all, it crashes the app. I must use the one in labs.
• Every other app, as well as every other text input field works just fine. Messaging is the only problem.

Outcome

What did you expect?

I expected the message to type properly

What happened instead?

The text box glitches out and deletes my messages See video below:

https://user-images.githubusercontent.com/65834069/210668726-a00a45cc-b0a5-4ebc-a518-16a2570e7c8c.mp4

Your phone model

OnePlus Nord N20 5G China Edition

Operating system version

Android 11

Application version and app store

Element version 1.5.18

Homeserver

uxn.one

Will you send logs?

Yes

Are you willing to provide a PR?

No

[jmartinesp]

There seem to be 2 different bugs in this report:

1. App crashing when using the current message composer.
2. Text being deleted when using the rich text editor composer. We have to pre-process the input, so this sometimes happens if the IME input doesn't match what we expect.

Could you tell us which keyboard are you using so we can try to reproduce the issues?

[Kruegerrr]

The IME @du82 used in the video is Trime, a buggy but open source IME for Chinese. Nevertheless, I believe this issue is related to how element handles inline composing. I have encountered a similar bug when using Chinese Pinyin keyboard of Gboard with inline composing enabled.

[Kruegerrr]

See #8521