Delete key does not work in insert mode with vi key bindings

[wcork]

When using vi mode via

set -g fish_key_bindings fish_vi_key_bindings

in config

The DELETE key does not function as expected in insert mode.

System info:

 ~  fish --version                                                                                                         00:11:36 2025-03-19
fish, version 4.0.1
 ~  kitty --version                                                                                                        00:11:40 2025-03-19
kitty 0.40.0 created by Kovid Goyal

[faho]

What does fish_key_reader --verbose say when you press delete?

What does bind -M insert <KEY> say?

What do you expect it to do? I don't think we've bound delete to anything in vi-insert mode.

[00-kat]

What do you expect it to do? I don't think we've bound delete to anything in vi-insert mode.

It appears to do the equivalent of delete-char in both Vim and Neovim, FWIW.

[wcork]

 ~  fish_key_reader --verbose                                                                                                                                                                     01:05:24 2025-03-19
Press a key:
# decoded from: \e\[3\;129\~
bind delete 'do something'
 ~  bind -M insert \e\[3\;129\~                                                                                                                                                           2s858ms 01:05:28 2025-03-19
bind: No binding found for key sequence '\e[3;129~'
 ~  fish_key_reader                                                                                                                                                                               01:06:07 2025-03-19
Press a key:
bind delete 'do something'
 ~  bind -M insert delete                                                                                                                                                                 1s447ms 01:06:21 2025-03-19
bind: No binding found for key “delete”

What do you expect it to do? I don't think we've bound delete to anything in vi-insert mode.

It appears to do the equivalent of delete-char in both Vim and Neovim, FWIW.

Correct.

Calling bind -s --preset -M insert delete delete-char was the expected behaviour