diff --git a/krita/ui/canvas/kis_abstract_canvas_widget.h b/krita/ui/canvas/kis_abstract_canvas_widget.h
--- a/krita/ui/canvas/kis_abstract_canvas_widget.h
+++ b/krita/ui/canvas/kis_abstract_canvas_widget.h
@@ -70,9 +70,6 @@
     // Called from KisCanvas2::slotSetDisplayProfile
     virtual void setDisplayProfile(KisDisplayColorConverter *colorConverter) = 0;
 
-    // Called from KisCanvas2::disconnectCurrentCanvas
-    virtual void disconnectCurrentCanvas() = 0;
-
     // Called from KisCanvas2::finishResizingImage
     virtual void finishResizingImage(qint32 w, qint32 h) = 0;
 
diff --git a/krita/ui/canvas/kis_canvas2.h b/krita/ui/canvas/kis_canvas2.h
--- a/krita/ui/canvas/kis_canvas2.h
+++ b/krita/ui/canvas/kis_canvas2.h
@@ -251,7 +251,6 @@
     Q_DISABLE_COPY(KisCanvas2)
 
     void connectCurrentCanvas();
-    void disconnectCurrentCanvas();
     void createCanvas(bool useOpenGL);
     void createQPainterCanvas();
     void createOpenGLCanvas();
diff --git a/krita/ui/canvas/kis_canvas2.cpp b/krita/ui/canvas/kis_canvas2.cpp
--- a/krita/ui/canvas/kis_canvas2.cpp
+++ b/krita/ui/canvas/kis_canvas2.cpp
@@ -484,11 +484,6 @@
     setLodAllowedInCanvas(m_d->lodAllowedInCanvas);
 }
 
-void KisCanvas2::disconnectCurrentCanvas()
-{
-    m_d->canvasWidget->disconnectCurrentCanvas();
-}
-
 void KisCanvas2::resetCanvas(bool useOpenGL)
 {
     // we cannot reset the canvas before it's created, but this method might be called,
@@ -503,7 +498,6 @@
          m_d->openGLFilterMode != cfg.openGLFilteringMode());
 
     if (needReset) {
-        disconnectCurrentCanvas();
         createCanvas(useOpenGL);
         connectCurrentCanvas();
         notifyZoomChanged();
diff --git a/krita/ui/canvas/kis_qpainter_canvas.h b/krita/ui/canvas/kis_qpainter_canvas.h
--- a/krita/ui/canvas/kis_qpainter_canvas.h
+++ b/krita/ui/canvas/kis_qpainter_canvas.h
@@ -65,7 +65,6 @@
     void setWrapAroundViewingMode(bool value);
     void channelSelectionChanged(const QBitArray &channelFlags);
     void setDisplayProfile(KisDisplayColorConverter *colorConverter);
-    void disconnectCurrentCanvas();
     void finishResizingImage(qint32 w, qint32 h);
     KisUpdateInfoSP startUpdateCanvasProjection(const QRect & rc, const QBitArray &channelFlags);
     QRect updateCanvasProjection(KisUpdateInfoSP info);
diff --git a/krita/ui/canvas/kis_qpainter_canvas.cpp b/krita/ui/canvas/kis_qpainter_canvas.cpp
--- a/krita/ui/canvas/kis_qpainter_canvas.cpp
+++ b/krita/ui/canvas/kis_qpainter_canvas.cpp
@@ -202,9 +202,6 @@
     return;
 }
 
-void KisQPainterCanvas::disconnectCurrentCanvas()
-{ }
-
 void KisQPainterCanvas::finishResizingImage(qint32 w, qint32 h)
 {
     m_d->prescaledProjection->slotImageSizeChanged(w, h);
diff --git a/krita/ui/opengl/kis_opengl_canvas2.h b/krita/ui/opengl/kis_opengl_canvas2.h
--- a/krita/ui/opengl/kis_opengl_canvas2.h
+++ b/krita/ui/opengl/kis_opengl_canvas2.h
@@ -80,7 +80,6 @@
     void setWrapAroundViewingMode(bool value);
     void channelSelectionChanged(const QBitArray &channelFlags);
     void setDisplayProfile(KisDisplayColorConverter *colorConverter);
-    void disconnectCurrentCanvas();
     void finishResizingImage(qint32 w, qint32 h);
     KisUpdateInfoSP startUpdateCanvasProjection(const QRect & rc, const QBitArray &channelFlags);
     QRect updateCanvasProjection(KisUpdateInfoSP info);
diff --git a/krita/ui/opengl/kis_opengl_canvas2.cpp b/krita/ui/opengl/kis_opengl_canvas2.cpp
--- a/krita/ui/opengl/kis_opengl_canvas2.cpp
+++ b/krita/ui/opengl/kis_opengl_canvas2.cpp
@@ -202,14 +202,6 @@
     }
 }
 
-void KisOpenGLCanvas2::disconnectCurrentCanvas()
-{
-    Q_ASSERT(d->openGLImageTextures);
-    d->openGLImageTextures->disconnect(canvas());
-    d->openGLImageTextures->disconnect(canvas()->image());
-}
-
-
 void KisOpenGLCanvas2::setWrapAroundViewingMode(bool value)
 {
     d->wrapAroundMode = value;
diff --git a/krita/ui/opengl/kis_opengl_image_textures.h b/krita/ui/opengl/kis_opengl_image_textures.h
--- a/krita/ui/opengl/kis_opengl_image_textures.h
+++ b/krita/ui/opengl/kis_opengl_image_textures.h
@@ -22,7 +22,6 @@
 
 #ifdef HAVE_OPENGL
 
-#include <QObject>
 #include <QVector>
 #include <QMap>
 
@@ -42,10 +41,8 @@
 /**
  * A set of OpenGL textures that contains the projection of a KisImage.
  */
-class KRITAUI_EXPORT KisOpenGLImageTextures : public QObject, public KisShared
+class KRITAUI_EXPORT KisOpenGLImageTextures : public KisShared
 {
-    Q_OBJECT
-
 public:
     /**
      * Obtain a KisOpenGLImageTextures object for the given image.
@@ -139,8 +136,6 @@
     KisOpenGLUpdateInfoSP updateCache(const QRect& rect);
     KisOpenGLUpdateInfoSP updateCacheNoConversion(const QRect& rect);
 
-public Q_SLOTS:
-
     void recalculateCache(KisUpdateInfoSP info);
 
     void slotImageSizeChanged(qint32 w, qint32 h);