VS Code Github Copilot Restore Checkpoint + Compact Conversation Issue

[PellucidDice]

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Bug

Copilot Feature Area

VS Code

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When you restore the chat to a previous checkpoint then compact the conversation using the context window, you lose the whole chat history and it will fail to compact the conversation with error "Nothing to compact. Start a conversation first.".

Tried to recover the conversation but redo button just does not do anything.
Happened multiple times to me in the past few days, with the latest version (0.38 ~ 0.39)

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[DevFoxxx]

Hi @PellucidDice, this looks like a state-sync bug between the 'Checkpoint' restore and the context management engine. When you restore a checkpoint, the metadata that tracks conversation history for the 'Compact' command seems to be getting wiped or de-indexed.

While waiting for a fix from the GitHub team, here is a workaround you can try:

• Trigger a Refresh: After restoring a checkpoint, try typing a simple prompt (e.g., 'Summary of above') and delete it. Sometimes this 'pokes' the context engine to re-index the chat history.
• Manual Clear: If it fails, use the command /clear (if available in your version) or manually copy the vital parts to a new chat.
• Extension Channel: Since this is a core UI/UX bug, try switching to the Copilot 'Pre-release' version in VS Code. They often push state-management fixes there first.

I recommend reporting this via the 'Report a Problem' menu inside VS Code (Help > Report Issue) so they can collect your logs!