[BUG] Unsent prompt text is cleared when switching between agent windows

[talha7k]

Description

When you have typed text in the input field (not yet submitted) and then switch to another agent's window (e.g., clicking on a sub-agent or using Ctrl+X to switch sessions), the unsent text is lost when you switch back to the original agent window.

Current behavior

1. Start typing a prompt in the input field (don't press Enter)
2. Switch to another agent's window or sub-agent
3. Switch back to the original agent window
4. The text you were typing is gone — input field is empty

Expected behavior

The unsent/draft text in the input field should be preserved when switching between agent windows and restored when switching back. This is standard behavior in most chat/messaging apps and IDEs — draft text survives tab/window switches.

Why this matters

• Users frequently switch between agents to check on sub-agent progress before submitting their next prompt
• Losing drafted text is frustrating and wastes time, especially for long, detailed prompts
• This discourages users from switching context to monitor running tasks, which reduces the usefulness of parallel agent delegation

OpenCode version

1.4.x

Operating System

macOS

Terminal

Any

[github-actions]

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

• Input text should be per-session: switching sessions should not carry over or lose draft text #14263: Same bug — draft/unsent input text is lost when switching between sessions, with the same expected fix (per-session input state preservation)

If this is indeed the same issue, please consider closing this one in favor of #14263.