extensions/git/src/decorationProvider.ts/GitDecorations/constructor
class GitDecorations:	constructor(private model: Model) {
		this.disposables.push(new GitIgnoreDecorationProvider(model));

		const onEnablementChange = filterEvent(workspace.onDidChangeConfiguration, e => e.affectsConfiguration('git.decorations.enabled'));
		onEnablementChange(this.update, this, this.disposables);
		this.update();
	}