diff -r 128efb9d148b -r 02f142b399b1 src/ui/canvas.h
--- a/src/ui/canvas.h	Tue Jul 20 01:22:01 2021 +0300
+++ b/src/ui/canvas.h	Sat Jul 24 01:50:38 2021 +0300
@@ -26,6 +26,8 @@
 		QWidget* parent = nullptr);
 	const PreviewLayer& getPreviewLayer(PreviewLayerName name) const;
 	PreviewLayer& modifyPreviewLayer(PreviewLayerName name);
+	void clearSelection();
+	void addToSelection(ldraw::id_t id);
 public slots:
 	void handleSelectionChange(const QSet<ldraw::id_t>& selectedIds, const QSet<ldraw::id_t>& deselectedIds);
 protected: