iOS 13.2 Chinese input randomly can not input characters

[Brooooooklyn]

monaco-editor version: 0.18.1
Browser:
Safari
OS:
iOS 13.2

Steps or JS usage snippet reproducing the issue:
Playground

[Brooooooklyn]

In iOS 13.2, System Chinese input will trigger an additional CompositionEvent with empty data after input some words.

[rcjsuen]

@Brooooooklyn The Monaco Editor doesn't support mobile platforms at the moment.

See #246, #1365, #1504, and I'm sure there are many more out there.

[Brooooooklyn]

iPad OS 13.2 has the same issue, even with physical keyboard. So I think it's worth to fix it.

[rebornix]

Thanks I can confirm that Safari on iOS emits double composition end events

Safari on macOS catalina

Safari on iOS13 emulator

@Brooooooklyn can you provide more details about how to reproduce the issue you described "randomly can not input characters" as I can't reproduce this issue from my side. Once a good reproduce step is provided, we can move this issue to VS Code repo.

[Brooooooklyn]

The screenshot below is running monaco editor playground on iOS 13.2 emulator
I can't find the step which can stablely input words successfully.
But I found that simply return when compositionend event emmited with empty string could fix this issue: https://github.com/microsoft/vscode/pull/84121/files#diff-b57d2c0cf11cc9d73357705196b8b3cbR276-R278