extensions/git/src/timelineProvider.ts/GitTimelineProvider/ensureProviderRegistration
class GitTimelineProvider:	private ensureProviderRegistration() {
		if (this.providerDisposable === undefined) {
			this.providerDisposable = workspace.registerTimelineProvider(['file', 'git', 'vscode-remote', 'gitlens-git'], this);
		}
	}