Plain-text paste is not undoable via Ctrl+Z in prompt editor

[gitRasheed]

Description

In the desktop app prompt editor, pasted plain-text does not become an undoable edit (Ctrl+Z does not revert it).

Plugins

No response

OpenCode version

v1.1.61

Steps to reproduce

1. Type text
2. Paste plain text (Ctrl+V)
3. Press Ctrl+Z

Actual: Typed input is undone, but the pasted block remains.
Expected: Plain-text paste should be undone atomically as a single edit via Ctrl+Z.

Screenshot and/or share link

before ctrl + z:

after ctrl + z:

Operating System

Windows 10

Terminal

No response