sc a11y: Pass OAccessible for ScAccessibleDocument parent

Switch parent param in the ScAccessibleDocument ctor
from the abstract XAccessible UNO interface to the
more concrete OAccessible.

Change-Id: I946317b6b60c499285ab6bd6d223fbfc16af604e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/210667
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

sc/source/ui/Accessibility/AccessibleDocument.cxx

@@ -1284,14 +1284,12 @@ void ScChildrenShapes::VisAreaChanged() const
             pAccShapeData->pAccShape->ViewForwarderChanged();
 }
 
-ScAccessibleDocument::ScAccessibleDocument(
-        const uno::Reference<XAccessible>& rxParent,
-        ScTabViewShell* pViewShell,
-        ScSplitPos eSplitPos)
-    : ImplInheritanceHelper(rxParent),
-    mpViewShell(pViewShell),
-    meSplitPos(eSplitPos),
-    mbCompleteSheetSelected(false)
+ScAccessibleDocument::ScAccessibleDocument(const rtl::Reference<comphelper::OAccessible>& rpParent,
+                                           ScTabViewShell* pViewShell, ScSplitPos eSplitPos)
+    : ImplInheritanceHelper(rpParent)
+    , mpViewShell(pViewShell)
+    , meSplitPos(eSplitPos)
+    , mbCompleteSheetSelected(false)
 {
     maVisArea = GetVisibleArea_Impl();
 }

sc/source/ui/inc/AccessibleDocument.hxx

@@ -44,10 +44,8 @@ class ScAccessibleDocument final
       public accessibility::IAccessibleViewForwarder
 {
 public:
-    ScAccessibleDocument(
-        const css::uno::Reference<css::accessibility::XAccessible>& rxParent,
-        ScTabViewShell* pViewShell,
-        ScSplitPos eSplitPos);
+    ScAccessibleDocument(const rtl::Reference<comphelper::OAccessible>& rpParent,
+                         ScTabViewShell* pViewShell, ScSplitPos eSplitPos);
 
     void PreInit();