[BUG] Windows desktop app: Cannot select/copy partial text from assistant responses (v2.1.79 regression)

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?

After updating to v2.1.79 on the Windows desktop app, it is no longer possible to select partial text within assistant responses. Previously, I could click and drag to highlight a specific sentence, paragraph, or any arbitrary range of text within a response and copy just that selection.

Now the only copy option is copying the entire message. There is no way to select a subset of text within a response.

This is a significant regression for workflows that involve copying specific excerpts from responses into other tools (e.g., pasting a specific paragraph into a Claude Chat session, extracting one recommendation from a longer response). Instead, I must copy the entire message and manually trim the content elsewhere.

What Should Happen?

User should be able to click and drag to select any portion of text within an assistant response (a word, sentence, paragraph, or arbitrary range) and copy it to the clipboard, as was possible in previous versions.

Error Messages/Logs

No error output — this is a UI behavior regression, not a crash or error.

Steps to Reproduce

1. Open Claude Code Windows desktop app (v2.1.79)
2. Have the assistant produce a multi-paragraph response
3. Attempt to click and drag to select a single sentence or paragraph within the response
4. Observe that partial text selection is not possible — the only option is to copy the entire message

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.79

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

• Interface: Claude Code Windows desktop app (not a terminal — the native Electron/desktop application)
• OS: Windows 11 Pro (build 10.0.26200)
• This is a regression — partial text selection within assistant responses worked in previous versions of the Windows desktop app.
• The "Terminal/Shell" dropdown above does not include the Claude Code desktop app as an option, so "Other" was selected.
• The primary impact is on workflows that require copying specific excerpts from responses to paste into other tools (e.g., a Claude Chat session, a document, Slack).