[bug] Edit tool overwrites unrelated accepted edits when applying multiple changes sequentially #3914

Description

When using the edit tool, the model often suggests multiple changes for the same file, each targeting different, non-conflicting sections (e.g., via parallel_tool). If I accept the first edit, it applies as expected. On accepting the second edit, it undoes the first and applies only its own change; the same happens for a third edit, which undoes the second. As a result, only the last accepted edit is present in the file, and previous, unrelated accepted changes are lost.

Expected: Accepting edits in sequence should result in all non-conflicting changes being incorporated into the file, not overwritten by subsequent accepted edits.

OpenCode version

1.0.23

Steps to reproduce

1. Request multiple (e.g., 3) non-conflicting edits for one file using the model's parallel_tool.
2. Accept the first change. It is applied as expected.
3. Accept the second change. The first change is overwritten (lost), and only the second change remains applied.
4. Accept the third change. The second change is now lost, and only the third is present -- instead of combining all non-conflicting changes.

Screenshot and/or share link

https://opencode.ai/s/GBhyYK1U

Operating System

ArchLinux

Terminal

konsole