extensions/typescript-language-features/src/languageFeatures/quickFix.ts/CodeActionSet/addAction
class CodeActionSet:	public addAction(action: VsCodeCodeAction) {
		for (const existing of this._actions) {
			if (action.tsAction.fixName === existing.tsAction.fixName && equals(action.edit, existing.edit)) {
				this._actions.delete(existing);
			}
		}

		this._actions.add(action);

		if (action.tsAction.fixId) {
			// If we have an existing fix all action, then make sure it follows this action
			const existingFixAll = this._fixAllActions.get(action.tsAction.fixId);
			if (existingFixAll) {
				this._actions.delete(existingFixAll);
				this._actions.add(existingFixAll);
			}
		}
	}