bug: multiple apply to the same file have wrong diff lines

[BhasherBEL]

Describe the bug

When avante suggest multiple changes inside one file, the diff lines aren't recalculate when editing the file. This lead to the following apply to be applied to the wrong lines. This has already been highlighted partially in a comment in #967.

To reproduce

• Ask a question that will generate changes in multiple places in a file.
• Apply the first diff (with a different amount of lines that the original code)
• Apply another diff
• The diff will apply to the wrong lines and be completely inconsistant.

Expected behavior

The lines should be recalculated, or avante should know where to apply the diff even when another place in the file has already be edited.

Installation method

Use nixvim with all it's default settings:

programs.nixvim = {
  ...
  plugins = {
    ....
    avante = {
      enable = true;
      settings = {
        claude = {
          api_key_name = "cmd:cat /run/secrets/api/anthropic";
        };
      };
    };
  };
};

Environment

NVIM v0.10.3
Build type: Release
LuaJIT 2.1.1713773202
Run "nvim -V1 -v" for more info

Linux desktop 6.12.11 #1-NixOS SMP PREEMPT_DYNAMIC Thu Jan 23 16:23:05 UTC 2025 x86_64 GNU/Linux

Repro

[philipn]

I have noticed this as well. To reproduce, simply use the 'a' option to apply one part of a multi-part diff rather than use 'A' to apply all diffs.

I think @yetone must use 'A' always or would have noticed this.