[BUG] [JetBrains plugin] Chat response area too small, cannot resize splitter

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

▎ In the JetBrains plugin chat panel, the response area is very small (shows ~3 lines of text) and the input area takes up 80% of the window. The splitter between response and input areas cannot be dragged to resize.

What Should Happen?

▎ The splitter between the response area and the input field should be draggable, allowing users to resize both areas. The response area should expand to show full responses without scrolling through 3 lines at a time.

Error Messages/Logs

Steps to Reproduce

1. Try to drag the splitter between the response area and the input field to resize

▎ 6. Splitter does not respond to drag — layout cannot be changed

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

 2.1.140 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

IntelliJ IDEA terminal

Additional Information

<img width="1509" height="848" alt="Image" src="https://github.com/user-attachments/assets/a48001eb-af73-49dc-9e9c-dbdbe6b87380" />