Unexpected behaviour on Neovim with ALE

[ottijp]

I found a unexpected behaviour on Neovim when using this plugin with ALE.
I'm not sure which causes this problem.

I would like to know how to fix this problem or if there is a workaround.

Problem

When I insert [] on each line in visual mode, the expected result is as follows:

[] hoge
[] piyo

However, I got the following result:

[] hoge
pi hoyo

lexima-reproduction.mov

This only occurs when I insert [] (with an additional space after the closing square bracket), but not when I insert [].

Reproduction

Before starting NeoVim:

git clone https://github.com/cohama/lexima.vim
git clone https://github.com/dense-analysis/ale

My init.vim:

set rtp+=lexima.vim
set rtp+=ale

Start NeoVim:

nvim -u init.vim

And type the following:

ihoge<CR>piyo<ESC>k^<C-v>jI[<Right> <ESC>

Environment

• OS: macOS 13.5
• NeoVim: 0.10.0
• ALE: 48d73c87c3c321e6298755abc5449267192d07e6(Fri Jul 12 03:40:38 2024 +0300)
• lexima: 5513d68(Wed Dec 20 13:10:40 2023 +0900)

$ sw_vers
ProductName:            macOS
ProductVersion:         13.5
BuildVersion:           22G74

$ nvim --version
NVIM v0.10.0
Build type: Release
LuaJIT 2.1.1716656478
Run "nvim -V1 -v" for more info

The problem occurs only in combination of Neovim and ALE.

	with ALE	problem occurs
Vim	false	false
Vim	true	false
NeoVim	false	false
NeoVim	true	true

[cohama]

Thanks for your report. I could reproduce this issue.

[cohama]

I think this issue is probably hard to fix. I have no idea why using with ALE causes this issue, and why vim is no problem.

[cohama]

Workaround is using <C-g>U<Right> instead of just <Right>. (See also :help i_CTRL-G_U)

<Right> (or any other cursor move keys) will break undo block. I think undo block is related to this issue.

[ottijp]

Thank you for your investigation.
Although I don't fully understand the details about the undo block, I have confirmed that the workaround works.

By the way, I really appreciate your efforts in developing and maintaining this handy plugin.
It helps me every day! 😀