Removed some whole page invalidations in impress

1. For tiled rendering, don't invalidate the whole page when hiding it
2. Don't invalidate when showing a page because we've just hidden the
previous one
3. No need for invalidation when setting visible layers

Change-Id: I858401b22c95093c58ec00896fe92b766fddb6de
Reviewed-on: https://gerrit.libreoffice.org/17452Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jan Holesovsky <kendy@collabora.com>

include/svx/svdpagv.hxx

@@ -216,7 +216,7 @@ public:
     void PagePosToLogic(Point& rPnt) const { rPnt+=aPgOrg; }
     void PagePosToLogic(Rectangle& rRect) const { rRect.Move(aPgOrg.X(),aPgOrg.Y()); }
 
-    void SetVisibleLayers(const SetOfByte& rSet) { aLayerVisi=rSet; InvalidateAllWin(); }
+    void SetVisibleLayers(const SetOfByte& rSet) { aLayerVisi=rSet; }
     const SetOfByte& GetVisibleLayers() const { return aLayerVisi; }
     void SetPrintableLayers(const SetOfByte& rSet) { aLayerPrn=rSet; }
     const SetOfByte& GetPrintableLayers() const { return aLayerPrn;  }

svx/source/svdraw/svdpagv.cxx

@@ -229,7 +229,6 @@ void SdrPageView::Show()
     if(!IsVisible())
     {
         mbVisible = true;
-        InvalidateAllWin();
 
         for(sal_uInt32 a(0L); a < GetView().PaintWindowCount(); a++)
         {
@@ -242,7 +241,10 @@ void SdrPageView::Hide()
 {
     if(IsVisible())
     {
-        InvalidateAllWin();
+        if (!GetView().GetModel()->isTiledRendering())
+        {
+            InvalidateAllWin();
+        }
         mbVisible = false;
         ClearPageWindows();
     }