diff -r 6988973515d2 -r ca23936b455b src/ui/canvas.cpp
--- a/src/ui/canvas.cpp	Wed May 25 20:36:34 2022 +0300
+++ b/src/ui/canvas.cpp	Mon Jun 06 22:01:22 2022 +0300
@@ -1,12 +1,11 @@
 #include <QMouseEvent>
 #include <QPainter>
-#include "modeleditor.h"
 #include "document.h"
 #include "canvas.h"
 
 Canvas::Canvas(
 	Model* model,
-	Document *document,
+	EditorTabWidget *document,
 	DocumentManager* documents,
 	const ldraw::ColorTable& colorTable,
 	QWidget* parent) :
@@ -21,9 +20,9 @@
  * @param selectedIds IDs of objects to select
  * @param deselectedIds IDs of objects to deselect.
  */
-void Canvas::handleSelectionChange(const QSet<ldraw::id_t>& selectedIds, const QSet<ldraw::id_t>& deselectedIds)
+void Canvas::handleSelectionChange(const QSet<ModelId> &selectedIds, const QSet<ModelId> &deselectedIds)
 {
-	Q_ASSERT(not selectedIds.contains(ldraw::NULL_ID));
+	Q_ASSERT(not selectedIds.contains({0}));
 	this->selection.subtract(deselectedIds);
 	this->selection.unite(selectedIds);
 	gl::setModelShaderSelectedObjects(&this->shaders, this->selection);
@@ -34,7 +33,7 @@
  * @brief Updates vertex rendering
  * @param document Document to get vertices from
  */
-void Canvas::rebuildVertices(Document* document)
+void Canvas::rebuildVertices(EditorTabWidget* document)
 {
 	if (this->vertexProgram.has_value())
 	{
@@ -45,7 +44,7 @@
 
 void Canvas::mouseMoveEvent(QMouseEvent* event)
 {
-	const ldraw::id_t id = this->pick(event->pos());
+	const ModelId id = this->pick(event->pos());
 	this->highlighted = id;
 	this->totalMouseMove += (event->pos() - this->lastMousePosition).manhattanLength();
 	this->worldPosition = this->screenToModelCoordinates(event->pos(), this->gridPlane);
@@ -339,7 +338,7 @@
 /**
  * @returns the ids of the currently selected objects 
  */
-const QSet<ldraw::id_t> Canvas::selectedObjects() const
+const QSet<ModelId> Canvas::selectedObjects() const
 {
 	return this->selection;
 }