Chat history truncated in editor area but visible in side panel

[feoktistove]

Description

Chat history appears truncated when using chat in the editor area, but the full history is visible when using the side panel chat view.

Steps to Reproduce

1. Open a chat session in the editor area (e.g., from command palette: "Chat: Open Chat")
2. Have a conversation with multiple exchanges
3. Observe that only recent messages are visible - older messages appear to be cut off
4. Move the same chat session to the side panel view
5. Observe that the full history becomes visible with proper scrolling

Expected Behavior

Chat history should be fully accessible via scrolling in both the editor area and side panel, with consistent behavior between the two views.

Actual Behavior

• Editor area: History appears truncated, older messages not accessible
• Side panel: Full history visible and scrollable

Additional Context

• No configuration settings appear to control this behavior
• Both views use the same ChatWidget implementation
• The tree widget has virtual scrolling enabled with supportDynamicHeights: true
• This appears to be a viewport/scrolling issue specific to the editor context

VS Code Version

Build from main branch (December 2025)

[bpasero]

@feoktistove can you share a video or screenshot?

[feoktistove]

@feoktistove can you share a video or screenshot?

I've recorded a video showing the issue.

Important clarification: The problem only occurs with chats opened directly in the editor area. If I start a chat in the sidebar and then move it to the editor, the full history remains accessible. This suggests the issue is with the initial layout/viewport calculation when creating a chat widget directly in editor context.

chat-history-truncated-editor-area.mov

[roblourens]

This may be fixed in 1.107- would appreciate if you can check that in the release this week (or latest Insiders)

[feoktistove]

Tested in the latest build (main, December 2025). Opened a chat in the editor area, exchanged 20+ messages, and confirmed that the entire chat history remains visible and scrollable - no truncation occurs.
The bug is fixed.
Thanks to the VS Code team for resolving this!