Ensure no exceptions when deleting undo history.

2 files changed, 7 insertions, 1 deletions

diff --git a/src/UndoHistory.cxx b/src/UndoHistory.cxx
index 9c1b89c94..1a956b998 100644
--- a/src/UndoHistory.cxx
+++ b/src/UndoHistory.cxx
@@ -173,6 +173,11 @@ bool UndoActions::AtStart(size_t index) const noexcept {
 	return !types[index-1].mayCoalesce;
 }
 
+void ScrapStack::Clear() noexcept {
+	stack.clear();
+	current = 0;
+}
+
 const char *ScrapStack::Push(const char *text, size_t length) {
 	if (current < stack.length()) {
 		stack.resize(current);
@@ -341,7 +346,7 @@ void UndoHistory::DeleteUndoHistory() noexcept {
 	currentAction = 0;
 	savePoint = 0;
 	tentativePoint = -1;
-	scraps = std::make_unique<ScrapStack>();
+	scraps->Clear();
 	memory = {};
 }
 
diff --git a/src/UndoHistory.h b/src/UndoHistory.h
index ab8c24250..1186a1e0e 100644
--- a/src/UndoHistory.h
+++ b/src/UndoHistory.h
@@ -59,6 +59,7 @@ class ScrapStack {
 	std::string stack;
 	size_t current = 0;
 public:
+	void Clear() noexcept;
 	const char *Push(const char *text, size_t length);
 	void SetCurrent(size_t position) noexcept;
 	void MoveForward(size_t length) noexcept;