Large snapshot diffs can hang session loading

[Yoshi-OOF]

Description

Opening a session with a very large edit diff can consume excessive memory or hang the TUI. In my repro, a formatter changed thousands of lines and continuing the session stalled while loading the diff-heavy turn.

Plugins

N/A

OpenCode version

1.15.12

Steps to reproduce

1. Create a session with a tool result that changes thousands of lines in a tracked file.
2. Continue or reopen the session.
3. Open the diff-heavy turn in the TUI or web UI.

Screenshot and/or share link

N/A

Operating System

Windows 11

Terminal

Windows Terminal

[github-actions]

This issue might be a duplicate of an existing issue. Please check:

• TUI hangs indefinitely when resuming sessions with large file diffs (formatPatch/structuredPatch blocks event loop) #23362: TUI hangs indefinitely when resuming sessions with large file diffs (formatPatch/structuredPatch blocks event loop) — describes the same symptom (session stalls/freezes when loading turns with large diffs) and identifies the root cause and a proposed fix.