tdf#94687: Keep original ordering of overall initialization steps

...between ScGridWindow::CreateAccessible, ScAccessibleDocument ctor, and
ScAccessibleDocument::Init, by introducing ScAccessibleDocument::PreInit into
which the this-using parts of the ScAccessibleDocument ctor are offloaded now.

This is a follow-up to 6f1e77fc, "rhbz#1264753:
Avoid this being release()ed to 0 in ScAccessibleDocument ctor;" turns out my
fears that the slight re-ordering of initialization code coulb break something
were well-founded after all.

Change-Id: Ibf62983030d7abbe4b1ead9ee5add5f9627e7d60

sc/source/ui/Accessibility/AccessibleDocument.cxx

@@ -1415,7 +1415,7 @@ ScAccessibleDocument::ScAccessibleDocument(
     maVisArea = GetVisibleArea_Impl();
 }
 
-void ScAccessibleDocument::Init()
+void ScAccessibleDocument::PreInit()
 {
     if (mpViewShell)
     {
@@ -1442,6 +1442,10 @@ void ScAccessibleDocument::Init()
             AddChild(xAcc, false);
         }
     }
+}
+
+void ScAccessibleDocument::Init()
+{
     if(!mpChildrenShapes)
         mpChildrenShapes = new ScChildrenShapes(this, mpViewShell, meSplitPos);
 }

sc/source/ui/inc/AccessibleDocument.hxx

@@ -63,6 +63,8 @@ public:
         ScTabViewShell* pViewShell,
         ScSplitPos eSplitPos);
 
+    void PreInit();
+
     virtual void Init() SAL_OVERRIDE;
 
     DECL_LINK_TYPED( WindowChildEventListener, VclWindowEvent&, void );

sc/source/ui/view/gridwin5.cxx

@@ -462,6 +462,7 @@ com::sun::star::uno::Reference< ::com::sun::star::accessibility::XAccessible >
     ScAccessibleDocument* pAccessibleDocument =
         new ScAccessibleDocument(GetAccessibleParentWindow()->GetAccessible(),
             pViewData->GetViewShell(), eWhich);
+    pAccessibleDocument->PreInit();
 
     xAcc = pAccessibleDocument;
     SetAccessible(xAcc);