tdf#96922 Suppress EditView PageVisuailsation in GraphicExporter

PageBackground is due to old constraints in exporters not completely
hindered when IsPageVisible() is already set for signalling that
all EditView-specific Page visualisations should be suppressed.
As long as these exporters are not adapted, use the setting of
SetPagePaintingAllowed() which consequently achieves this.

Change-Id: I2222a799533f763b54b2210a46c24aa8ae92d7a2
Reviewed-on: https://gerrit.libreoffice.org/22837
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>

svx/source/unodraw/UnoGraphicExporter.cxx

@@ -744,6 +744,10 @@ bool GraphicExporter::GetGraphic( ExportSettings& rSettings, Graphic& aGraphic,
                 pView->SetPageVisible( false );
                 pView->ShowSdrPage( pPage );
 
+                // tdf#96922 completely deactivate EditView PageVisualization, including
+                // PageBackground (formally 'wiese').
+                pView->SetPagePaintingAllowed(false);
+
                 const Point aNewOrg( pPage->GetLftBorder(), pPage->GetUppBorder() );
                 aNewSize = Size( aSize.Width() - pPage->GetLftBorder() - pPage->GetRgtBorder(),
                                  aSize.Height() - pPage->GetUppBorder() - pPage->GetLwrBorder() );