`apply_patch` tool diff does not reflect formatter changes

[JDNdeveloper]

Description

After using a model that uses the apply_patch tool (e.g. ChatGPT 5.3 Codex), the diff shown does not reflect the formatter changes that were also applied.

Plugins

No response

OpenCode version

1.2.15

Steps to reproduce

1. Create a file named repro.py:

def a():
    """x"""
    return 'y'

2. Apply this patch to repro.py (ask the agent to update "x" to "x updated"):

*** Begin Patch
*** Update File: /absolute/path/to/repro.py
@@
-    """x"""
+    """x updated"""
*** End Patch

3. Inspect repro.py after patch. It becomes:

def a():
    """x updated"""
    return "y"

4. Observe that the diff shown does NOT show the formatting change that was performed.

Screenshot and/or share link

edit tool:

apply_patch tool:

Operating System

Windows 11 WSL

Terminal

Windows Terminal