cool#12574 Show empty placeholder objects if they have background or linestyle

Signed-off-by: Gülşah Köse <gulsah.kose@collabora.com>
Change-Id: Iebb32f0d18de271ea14bf77565c72d1b38073b30
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/189512
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Reviewed-by: Szymon Kłos <szymon.klos@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/193014
Tested-by: Jenkins

sd/source/ui/tools/SlideshowLayerRenderer.cxx

@@ -460,7 +460,8 @@ public:
         SdrObject* pObject = rOriginal.GetViewContact().TryToGetSdrObject();
 
         // Check if we are rendering an object that is valid to render (exists, and not empty)
-        if (pObject == nullptr || pObject->IsEmptyPresObj())
+        if (pObject == nullptr
+            || (pObject->IsEmptyPresObj() && !(pObject->HasFillStyle() || pObject->HasLineStyle())))
             return;
 
         SdrPage* pPage = pObject->getSdrPageFromSdrObject();