Ctrl-[ don't escape from insert mode (like Esc) on Belgian keyboard

[vds2212]

Steps to reproduce

On a computer with a Belgian keyboard using gVim

1. Start Vim
2. Enter in insert mode
3. Type: Ctrl-[

Expected behaviour

You should be back in Normal mode but you stay in insert mode.

Version of Vim

8.2.4943 on Windows 10 8.2.3995 on Ubuntu 22.04

Environment

Operating System: Windows 10 or Ubuntu 22.04

I can only reproduce the problem on gVim (on Vim the problem do not occur)

Logs and stack traces

No response

[vds2212]

I have compiled different tags of Vim on Windows 10.
I don't have the problem at version 8.2.4006
But I do have the problem at version 8.2.4007 and later

[chrisbra]

I think this is a duplicate of #10324

[vds2212]

I cross checked and the issue is present in the new Vim 9.0. I'm afraid without the problem solved I will not be able to use gVim 9.0. What would you suggest me to push the resolution of this problem?

[brammool]

@LemonBoy was working on a solution, but it didn't get completed yet.

[vds2212]

Thanks! Let me know if I can contribute in any ways.

[brammool]

Patch 9.0.0033 fixes this for GTK, but it is still a problem for MS-Windows

[vds2212]

Thanks for the update :-)

[tonymec]

WFM on gvim (Big, GTK3) 9.0.32 i.e. without the patch. Don't forget, however, that on a Belgian keyboard, [ is AltGr+dead-circumflex, therefore Ctrl+[ is Ctrl+AltGr+dead-circumflex.

Best regards,
Tony.

[vds2212]

Hi Tony,

I have tested version 9.0.35 and the problem is still present in gVim.

On gVim 8.2 I can escape using: Ctrl+DeadCircumflex
On gVim 9.0 I can't escape neither Ctrl+DeadCircumflex nor Ctrl+AltGr+DeadCircumflex

Remark: The problem is not present on Vim 9.0

Best regards,
Vivian

[vds2212]

Anton has created a azerty_ctrl_dead branch in his repository https://github.com/haron13-2019/vim/tree/azerty_ctrl_dead and made a Pull Request (#10687)
This seems to solve the problem on Belgian keyboards.