Autocompletion overwrites text (rust-analyzer)

[axelkar]

FAQ

• I have checked the FAQ and it didn't resolve my problem.

Announcement

• I have checked Breaking change announcement.

Minimal reproducible full config

-- I have rustaceanvim in runtimepath; it doesn't need setup

local cmp = require("cmp")
cmp.setup({
    mapping = {
        ["<CR>"] = cmp.mapping.confirm({ behavior = cmp.ConfirmBehavior.Replace, select = true }),
        ["<S-Tab>"] = cmp.mapping(function(fallback)
            local luasnip = require("luasnip")
            if cmp.visible() then
                cmp.select_prev_item()
            elseif luasnip.jumpable(-1) then
                luasnip.jump(-1)
            else
                fallback()
            end
        end, { "i", "s" }),
        ["<Tab>"] = cmp.mapping(function(fallback)
            local luasnip = require("luasnip")
            if cmp.visible() then
                cmp.select_next_item()
            elseif luasnip.expandable() then
                luasnip.expand()
            elseif luasnip.expand_or_jumpable() then
                luasnip.expand_or_jump()
            -- elseif check_backspace() then
            --   fallback()
            else
                fallback()
            end
        end, { "i", "s" }),
    },
    snippet = {
        expand = function(args)
            require("luasnip").lsp_expand(args.body)
        end,
    },
    sources = { { name = "nvim_lsp" } },
})

require("luasnip").config.setup({})

Note: I did reproduce this with this config but didn't update the gif

Description

• VSCodium doesn't reproduce this
• Completions which don't require import (e.g. an identifier in the same scope) don't overwrite the line
• When I import DoubleEndedSearcher, type Doub and tab (it's not the first option) to DoubleEndedIterator (in the prelude), it overwrites too

Steps to reproduce

1. Install Rustaceanvim, luasnip, cmp-nvim-lsp and nvim-cmp into your runtimepath
2. Start a blank Rust project and do as seen in the GIF below

Expected behavior

Should not overwrite the text

Actual behavior

Additional context

I'm using 99290b3ec1322070bcfb9e846450a46f6efa50f0 and ed31156

[tjex]

I by chance just saw this in the docs.
Maybe it helps, although I don't see it set in your config, and the default is to insert, instead of replace.

*cmp.confirm* (option: cmp.ConfirmOption, callback: function)
  Accepts the currently selected completion item.
  If you didn't select any item and the option table contains `select = true`,
  nvim-cmp will automatically select the first item.

  You can control how the completion item is injected into
  the file through the `behavior` option:

  `behavior=cmp.ConfirmBehavior.Insert`: inserts the selected item and
    moves adjacent text to the right (default).
  `behavior=cmp.ConfirmBehavior.Replace`: replaces adjacent text with
    the selected item.
>lua
  cmp.setup {
    mapping = {
      ["<CR>"] = cmp.mapping.confirm({ select = true, behavior = cmp.ConfirmBehavior.Replace }),
    }
  }