From ff92575e4074d484cde19711928b1dde5918474f Mon Sep 17 00:00:00 2001
From: Andrew Belt <andrewpbelt@gmail.com>
Date: Sun, 31 Oct 2021 23:20:11 -0400
Subject: [PATCH] Add Internal struct to history::State.

---
 include/history.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/history.hpp b/include/history.hpp
index 045f6aab..49612053 100644
--- a/include/history.hpp
+++ b/include/history.hpp
@@ -158,6 +158,9 @@ struct CableRemove : InverseAction<CableAdd> {
 
 
 struct State {
+	struct Internal;
+	Internal* internal;
+
 	std::deque<Action*> actions;
 	int actionIndex;
 	/** Action index of saved patch state. */