Agents - start cleaning up IChatSessionFileChange and IChatSessionFileChange2

[lszomoru]

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[github-actions]

Screenshot Changes

Base: 4e26289a Current: 0095cf4e

Changed (2)

chat/aiCustomizations/aiCustomizationManagementEditor/McpBrowseMode/Light

Before	After

editor/inlineCompletions/other/JumpToHint/Dark

Before	After

[Copilot]

Pull request overview

This PR starts consolidating the Agents window “session changes” typing by introducing a sessions-layer alias that can represent both legacy IChatSessionFileChange and newer IChatSessionFileChange2, then updating session-facing interfaces/adapters to use that alias.

Changes:

• Add ISessionFileChange (union of IChatSessionFileChange | IChatSessionFileChange2) and update IChat/ISession to expose changes as ISessionFileChange[].
• Update ICopilotChatSession and AgentSessionAdapter to surface changes as ISessionFileChange[].

Show a summary per file

File	Description
src/vs/sessions/services/sessions/common/session.ts	Introduces ISessionFileChange and updates session/chat interfaces to use it for changes.
src/vs/sessions/contrib/copilotChatSessions/browser/copilotChatSessionsProvider.ts	Moves session provider-facing changes typing toward ISessionFileChange[] and widens AgentSessionAdapter extraction accordingly.

Copilot's findings

Comments suppressed due to low confidence (1)

src/vs/sessions/contrib/copilotChatSessions/browser/copilotChatSessionsProvider.ts:183

• CopilotCLISession now declares _changes/changes as ISessionFileChange[], but the constructor still initializes _changes with observableValue<readonly IChatSessionFileChange[]>(..., []) (later in the class). Because observableValue’s return type is invariant (it has a set method), this will not type-check. Initialize _changes with ISessionFileChange[] (or remove the explicit generic and let it infer from the _changes declaration) so the types match end-to-end.

	private readonly _changes: ReturnType<typeof observableValue<readonly ISessionFileChange[]>>;
	readonly changes: IObservable<readonly ISessionFileChange[]>;

• Files reviewed: 9/9 changed files
• Comments generated: 1