Some more spots where the GAL refresh was required.

common/drawframe.cpp

@@ -234,8 +234,12 @@ void EDA_DRAW_FRAME::SkipNextLeftButtonReleaseEvent()
 void EDA_DRAW_FRAME::OnToggleGridState( wxCommandEvent& aEvent )
 {
     SetGridVisibility( !IsGridVisible() );
+
     if( m_galCanvasActive )
+    {
         m_galCanvas->GetGAL()->SetGridVisibility( IsGridVisible() );
+        m_galCanvas->GetView()->MarkTargetDirty( KiGfx::TARGET_NONCACHED );
+    }
 
     RefreshCanvas();
 }
@@ -392,11 +396,12 @@ void EDA_DRAW_FRAME::OnSelectGrid( wxCommandEvent& event )
 
     if( m_galCanvasActive )
     {
-        KiGfx::GAL* gal = m_galCanvas->GetGAL();
-        gal->SetGridSize( VECTOR2D( screen->GetGrid().m_Size.x, screen->GetGrid().m_Size.y ) );
+        m_galCanvas->GetGAL()->SetGridSize( VECTOR2D( screen->GetGrid().m_Size.x,
+                                                      screen->GetGrid().m_Size.y ) );
+        m_galCanvas->GetView()->MarkTargetDirty( KiGfx::TARGET_NONCACHED );
     }
 
-    Refresh();
+    RefreshCanvas();
 }
 
 
@@ -1011,6 +1016,8 @@ void EDA_DRAW_FRAME::UseGalCanvas( bool aEnable )
     m_auimgr.GetPane( wxT( "DrawFrameGal" ) ).Show( aEnable );
     m_auimgr.Update();
 
-    m_galCanvas->SetFocus();
     m_galCanvasActive = aEnable;
+
+    if( aEnable )
+        m_galCanvas->SetFocus();
 }

include/view/view.h

@@ -267,7 +267,12 @@ public:
      */
     inline void SetLayerVisible( int aLayer, bool aVisible = true )
     {
-        m_layers[aLayer].enabled = aVisible;
+        if( m_layers[aLayer].enabled != aVisible )
+        {
+            // Target has to be redrawn after changing its visibility
+            MarkTargetDirty( m_layers[aLayer].target );
+            m_layers[aLayer].enabled = aVisible;
+        }
     }
 
     /**

pcbnew/class_pcb_layer_widget.cpp

@@ -393,7 +393,7 @@ void PCB_LAYER_WIDGET::OnLayerVisible( LAYER_NUM aLayer, bool isVisible, bool is
 
     brd->SetVisibleLayers( visibleLayers );
 
-    EDA_DRAW_PANEL_GAL *galCanvas = myframe->GetGalCanvas();
+    EDA_DRAW_PANEL_GAL* galCanvas = myframe->GetGalCanvas();
     if( galCanvas )
     {
         KiGfx::VIEW* view = galCanvas->GetView();
@@ -401,12 +401,7 @@ void PCB_LAYER_WIDGET::OnLayerVisible( LAYER_NUM aLayer, bool isVisible, bool is
     }
 
     if( isFinal )
-    {
-        if( myframe->IsGalCanvasActive() )
-            galCanvas->Refresh();
-        else
-            myframe->RefreshCanvas();
-    }
+        myframe->RefreshCanvas();
 }
 
 void PCB_LAYER_WIDGET::OnRenderColorChange( int aId, EDA_COLOR_T aColor )