1091536701
* agent host: hydrate snapshot controller for Restore Checkpoint Currently the AgentHostSnapshotController never has any checkpoints to restore to when "Restore Checkpoint" is invoked, so the removed request stays visible in the chat UI. This fix wires up hydration end-to-end and simplifies the controller's bookkeeping along the way. - Seed a request-level checkpoint for every historical turn on session open, not only turns with file edits. Without this, restoreSnapshot for any turn that lacked tool calls fell through with "No checkpoint found" and _setDisabledRequests was never called. - Always populate _pendingHistoryTurns from the protocol state (previously gated on hasTurnsWithEdits), and stop using Event.once on onDidCreateModel to wait for the chat model — the once subscription was being consumed by an unrelated model created first, leaving the controller un-hydrated. Now we synchronously hydrate when the model already exists, otherwise listen until the matching session arrives. - Make ensureRequestCheckpoint advance _currentCheckpointIndex to the new checkpoint. Previously the cursor stayed put, so requestDisablement marked the in-flight request as disabled (the new checkpoint sat "forward" of the cursor) and the next call would splice it away. - Simplify to one checkpoint per request. Multiple tool calls in the same request now fold their edits into a single checkpoint via a seenToolCallIds Set, and restoreSnapshot/getSnapshotUri/ getSnapshotContents ignore the stopId parameter. canUndo/canRedo derive purely from cursor position — undo/redo is request-level, available whenever any checkpoint exists. - Add tests covering: in-flight request isn't disabled, restore of a no-edit request marks it disabled, stale forward branch is spliced on new request after restore-to-start, and multi-tool-call edits undo together. Fixes https://github.com/microsoft/vscode/issues/318251 (Commit message generated by Copilot) * agent host: address review feedback - Fold multiple tool-call edits to the same file in one request into a single net before/after pair (mergeFileEdit). Without this, _writeCheckpointContent applied duplicate writes in parallel and raced. - Refresh stale 'sentinel' wording in session handler comments. (Commit message generated by Copilot)
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