vim: entering insert mode with 'a' can place cursor in middle of emojis

[kevinushey]

To reproduce, in kitchen sink:

https://ace.c9.io/build/kitchen-sink.html

1. Turn on Vim keybindings,
2. Copy and paste the emoji 😇into the editor,
3. Press a to enter insert mode "after" the character under the carat,
4. Notice that the carat is placed "in the middle" of the emoji.

At this point, pressing Backspace also removes the first element of the surrogate pair making up the emoji, leaving behind the other (now invalid) piece.

[github-actions]

This issue has not received any attention in 1 year. If you want to keep this issue open, please leave a comment below and auto-close will be canceled.

[kevinushey]

Appears to still be an issue.

[andrewnester]

I tried to reproduce this on the latest version of Ace in kitchen sink using your steps and it does not seem to be reproducible. Could you please confirm that?

[kevinushey]

Very weird... I tried to reproduce again, and it seems like it reproduces inconsistently? For example:

Screen.Recording.2022-06-29.at.11.07.39.AM.mov

Using x to delete a character seems to always delete the first "half" of the emoji, though.

[andrewnester]

This PR fixes the issue in our dependency replit/codemirror-vim#49

Once it's merged we can update the dependency

[andrewnester]

Fixed by this PR #4933 and released in version 1.11.1

[andrewnester]

Added additional fixes and released in 1.11.2
https://github.com/ajaxorg/ace/releases/tag/v1.11.2