Backport: Delete standard methods of UndoGroup so it can not be copied.

Backport of changeset 7286:41c0c578ed2a.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/Document.h b/src/Document.h
index 927bbd77c..a50fcac70 100644
--- a/src/Document.h
+++ b/src/Document.h
@@ -507,6 +507,11 @@ public:
 			pdoc->BeginUndoAction();
 		}
 	}
+	// Deleted so UndoGroup objects can not be copied.
+	UndoGroup(const UndoGroup &) = delete;
+	UndoGroup(UndoGroup &&) = delete;
+	void operator=(const UndoGroup &) = delete;
+	UndoGroup &operator=(UndoGroup &&) = delete;
 	~UndoGroup() {
 		if (groupNeeded) {
 			pdoc->EndUndoAction();