diff -r 94c92c923713 -r 40a1cf2f38f5 src/document.h
--- a/src/document.h	Sun Jul 25 13:49:37 2021 +0300
+++ b/src/document.h	Sun Jul 25 16:26:38 2021 +0300
@@ -42,6 +42,7 @@
 	QByteArray saveSplitterState() const;
 	void restoreSplitterState(const QByteArray& state);
 	void setRenderPreferences(const gl::RenderPreferences& newPreferences);
+	void setCanvasOverpaintCallback(Canvas::OverpaintCallback fn);
 signals:
 	void newStatusText(const QString& newStatusText);
 	void splitterChanged();