extensions/typescript-language-features/src/languageFeatures/quickFix.ts/CodeActionSet/addFixAllAction
class CodeActionSet:	public addFixAllAction(fixId: {}, action: VsCodeCodeAction) {
		const existing = this._fixAllActions.get(fixId);
		if (existing) {
			// reinsert action at back of actions list
			this._actions.delete(existing);
		}
		this.addAction(action);
		this._fixAllActions.set(fixId, action);
	}