Deleting a message from conversation history can cause data loss and prevent further conversation

[System233]

App Version

3.11.8

API Provider

OpenRouter

Model Used

N/A

Actual vs. Expected Behavior

When a user deletes a message from the conversation history by clicking the delete button, there is a chance that data loss will occur, preventing the conversation from continuing. Specifically, when the user clicks the delete button on a message and it disappears, it can sometimes cause the entire conversation to become stuck, and any subsequent messages will fail to trigger an API request, meaning the AI will not respond.

While the conversation history remains viewable, new messages cannot be sent. Upon investigation, it was found that the corresponding api_conversation_history.json file has been cleared, containing only an empty array ([]).

I have encountered this bug twice already.

Detailed Steps to Reproduce

The issue typically arises when deleting the same message twice or more in sequence. For example:

• The user deletes message A and returns to the position of message A;
• The user sends a new message B, cancels the API request, then deletes B;
• On sending a new message again, no API request is triggered, and the AI does not respond. The VSCode extension logs show no errors during this process.

Relevant API Request Output

Additional Context

No response

[daniel-lxs]

Deleting messages in the conversation, particularly repeatedly or after cancelling an API request, can wipe the api_conversation_history.json file. This happens because the message deletion logic in src/core/webview/webviewMessageHandler.ts can, in certain scenarios (like when apiConversationHistoryIndex becomes 0), slice the history into an empty array. This empty array is then saved by Task.overwriteApiConversationHistory() and saveApiMessages(), leading to data loss and preventing further conversation. A fix would involve adjusting the slicing logic in src/core/webview/webviewMessageHandler.ts to prevent accidental creation of an empty history during targeted message deletions.