cmdline: Multi-argument completions include duplicate prefix

[b0o]

Make sure you have done the following

• I have updated to the latest version of blink.cmp
• I have read the README

Bug Description

Accepting a completion for certain command arguments results in the prefix being prepended to the completion text. For example:

With :lua:

1. initial: :lua vim.no
2. accept completion for vim.notify
3. actual: :lua vim.vim.notify
4. expected: :lua vim.notify

With :set:

1. initial: :set ft=lu
2. accept completion for lua
3. actual: :set ft=ft=lua
4. expected: :set ft=lua

Similar behavior when completing filepaths e.g. :e /etc, lua expression inspecting e.g. :=vim.notify, and probably others.

Relevant configuration

Default settings. Tested with default, super-tab, and enter cmdline mappings presets.

neovim version

NVIM v0.11.0-dev-1273+g7a367c6967

blink.cmp version: branch, tag, or commit

217f670

[the-fuckin-nobody]

This is a duplicate of #46 and #541, I guess.

[b0o]

Ah, thanks, I should have checked more closely.