1 files changed, 3 insertions, 52 deletions

diff --git a/src/CellBuffer.h b/src/CellBuffer.h
index 701472f4f..d71287d1b 100644
--- a/src/CellBuffer.h
+++ b/src/CellBuffer.h
@@ -20,7 +20,9 @@ public:
 	virtual void RemoveLine(Sci::Line line)=0;
 };
 
+class UndoHistory;
 class ChangeHistory;
+
 /**
  * The line vector contains information about each of the lines in a cell buffer.
  */
@@ -44,57 +46,6 @@ public:
 	void Clear() noexcept;
 };
 
-/**
- *
- */
-class UndoHistory {
-	std::vector<Action> actions;
-	int maxAction;
-	int currentAction;
-	int undoSequenceDepth;
-	int savePoint;
-	int tentativePoint;
-	std::optional<int> detach;
-
-	void EnsureUndoRoom();
-
-public:
-	UndoHistory();
-
-	const char *AppendAction(ActionType at, Sci::Position position, const char *data, Sci::Position lengthData, bool &startSequence, bool mayCoalesce=true);
-
-	void BeginUndoAction();
-	void EndUndoAction();
-	void DropUndoSequence() noexcept;
-	void DeleteUndoHistory();
-
-	/// The save point is a marker in the undo stack where the container has stated that
-	/// the buffer was saved. Undo and redo can move over the save point.
-	void SetSavePoint() noexcept;
-	bool IsSavePoint() const noexcept;
-	bool BeforeSavePoint() const noexcept;
-	bool BeforeReachableSavePoint() const noexcept;
-	bool AfterSavePoint() const noexcept;
-	bool AfterDetachPoint() const noexcept;
-
-	// Tentative actions are used for input composition so that it can be undone cleanly
-	void TentativeStart() noexcept;
-	void TentativeCommit() noexcept;
-	bool TentativeActive() const noexcept;
-	int TentativeSteps() noexcept;
-
-	/// To perform an undo, StartUndo is called to retrieve the number of steps, then UndoStep is
-	/// called that many times. Similarly for redo.
-	bool CanUndo() const noexcept;
-	int StartUndo() noexcept;
-	const Action &GetUndoStep() const noexcept;
-	void CompletedUndoStep() noexcept;
-	bool CanRedo() const noexcept;
-	int StartRedo() noexcept;
-	const Action &GetRedoStep() const noexcept;
-	void CompletedRedoStep() noexcept;
-};
-
 struct SplitView {
 	const char *segment1 = nullptr;
 	size_t length1 = 0;
@@ -137,7 +88,7 @@ private:
 	Scintilla::LineEndType utf8LineEnds;
 
 	bool collectingUndo;
-	UndoHistory uh;
+	std::unique_ptr<UndoHistory> uh;
 
 	std::unique_ptr<ChangeHistory> changeHistory;